Ordinal Numbers in Arabic

In Brief

Arabic ordinal numbers usually behave like adjectives (words that describe a noun). They follow the noun and match its gender and definiteness: الكتاب الأول “the first book,” but المرة الأولى “the first time.” أول is also common before a noun without الـ, especially in expressions such as أول مرة “the first time.”

Overview

Ordinal numbers identify a position in an ordered series: first, second, third, and so on. Arabic calls them الأعداد الترتيبية. You need them for floors, chapters, lessons, competition results, anniversaries, centuries, and the order of events. They are different from cardinal numbers, which answer “how many?”: ثلاثة كتب means “three books,” while الكتاب الثالث means “the third book.”

The core system is introduced here at B1, but it builds directly on two earlier topics: Arabic number forms and adjective agreement. A noun is a word for a person, place, thing, or idea; in Arabic, every noun is grammatically masculine or feminine. An ordinal used after that noun normally agrees with it just as an adjective does.

The most useful beginner rule is simple: choose the masculine or feminine ordinal, put it after the noun, and give both words الـ when the phrase is definite. Later sections explain the special behavior of أول, ordinals above ten, case endings, and expressions such as “second-largest.”

How It Works

The forms from first to tenth

Most ordinals from second through tenth follow the pattern فاعِل. A pattern is a reusable arrangement of consonants and vowels into which an Arabic root fits. The masculine forms have no ة; the usual feminine forms add ـة. “First” is less regular and has the special feminine form أولى.

Position	Masculine	Feminine	Definite masculine	Definite feminine
first	أول	أولى	الأول	الأولى
second	ثانٍ / ثاني	ثانية	الثاني	الثانية
third	ثالث	ثالثة	الثالث	الثالثة
fourth	رابع	رابعة	الرابع	الرابعة
fifth	خامس	خامسة	الخامس	الخامسة
sixth	سادس	سادسة	السادس	السادسة
seventh	سابع	سابعة	السابع	السابعة
eighth	ثامن	ثامنة	الثامن	الثامنة
ninth	تاسع	تاسعة	التاسع	التاسعة
tenth	عاشر	عاشرة	العاشر	العاشرة

The indefinite masculine “second” is often written ثانٍ when it stands with a nominative or genitive case ending. In ordinary unvocalized text, you will also encounter ثاني, especially before another noun or in contexts where the ending is not shown. The definite form is consistently written الثاني.

Do not copy the gender reversal used with the cardinal numbers three through ten. Cardinal ثلاثة is used with a masculine noun in ثلاثة كتب “three books,” but ordinal ثالث directly matches a masculine noun in الكتاب الثالث “the third book.” With a feminine noun, use الثالثة: الصفحة الثالثة “the third page.”

Normal word order: noun + ordinal

In the standard adjective construction, the noun comes first:

• درس أول — a first lesson
• الدرس الأول — the first lesson
• محاولة ثانية — a second attempt
• المحاولة الثانية — the second attempt

Definiteness means whether a phrase points to a specific, identifiable thing. The prefix الـ is the Arabic definite article, roughly equivalent to English “the.” If the noun is definite, its ordinal adjective is definite too: الباب الرابع, not الباب رابع. If the noun is indefinite, neither word takes الـ: باب رابع.

English does not mark grammatical gender on “first,” “second,” or “third,” so English-speaking learners must make an extra choice in Arabic. Identify the gender of the noun—not the gender of the person speaking—and then choose the matching ordinal. Thus اليوم الأول uses masculine الأول because يوم is masculine, while السنة الأولى uses feminine الأولى because سنة is feminine.

The special construction with أول

Arabic also places أول before a following noun in many common expressions:

• أول مرة — the first time
• أول يوم — the first day
• أول خطوة — the first step
• أول سؤال — the first question

Here أول has no definite article. This is a noun-linking or construct-like expression rather than the ordinary noun + adjective order. Do not add الـ mechanically: أول مرة is natural, while الأول مرة is not.

The post-noun adjective construction remains available and is often useful when the noun is already definite: المرة الأولى, اليوم الأول, الخطوة الأولى. The two patterns often translate the same way, but their grammar is different:

Pattern	Example	Meaning
أول + noun	أول مرة	the first time
definite noun + definite ordinal	المرة الأولى	the first time

The pre-noun use is especially frequent with أول. Do not assume that every ordinal can be moved in front of the noun in the same way.

Agreement beyond gender

A full Arabic adjective agrees with its noun in gender, definiteness, number, and case. Case is the ending that marks a word’s role in a formal, fully vocalized sentence. In most everyday writing, short case vowels are not printed, so these examples look identical on the page:

• الدرسُ الثالثُ — the third lesson, as the subject
• قرأتُ الدرسَ الثالثَ — I read the third lesson
• في الدرسِ الثالثِ — in the third lesson

The matching final vowels matter in carefully vocalized Modern Standard Arabic, formal reading, and Qur’anic or literary study. For ordinary reading and writing, first master gender, definiteness, and word order.

When an ordinal modifies one item in a sequence, the noun is normally singular: الفصل الخامس “the fifth chapter.” Plural agreement appears when the ordinal describes a plural group, as in الفصول الثلاثة الأولى “the first three chapters.” This combines ordinal agreement with the broader rules for plural adjectives.

Examples in Context

Arabic	English	Note
الكتاب الأول مفيد جدًا.	The first book is very useful.	Masculine, definite
هذه المرة الثانية.	This is the second time.	Feminine agreement with مرة
نسكن في الطابق الثالث.	We live on the third floor.	After a preposition
قرأت الفصل الرابع أمس.	I read the fourth chapter yesterday.	Masculine ordinal after الفصل
هي الطالبة الخامسة في القائمة.	She is the fifth student on the list.	Feminine ordinal for a female student
يبدأ الدرس السادس بعد الاستراحة.	The sixth lesson begins after the break.	Definite noun and ordinal
وصلت الحافلة السابعة متأخرة.	The seventh bus arrived late.	Feminine because حافلة is feminine
السؤال الثامن صعب.	The eighth question is difficult.	Masculine form ثامن
فاز الفريق التاسع بالمباراة.	The ninth team won the match.	Position in a series
هذا هو اليوم العاشر من الرحلة.	This is the tenth day of the trip.	Masculine tenth
كانت تلك أول مرة أزور فيها عمّان.	That was the first time I visited Amman.	Common pre-noun أول construction
سأحاول مرة ثانية.	I will try a second time.	Indefinite noun and ordinal
للمرة الثالثة، نسيت مفاتيحي.	For the third time, I forgot my keys.	Fixed phrase with لـ
احتلّت العدّاءة المركز الأول.	The runner took first place.	المركز is masculine despite a female runner
الملك عبد الله الثاني	King Abdullah II	Ordinal used in a royal name

Common Mistakes

Using the cardinal number instead of the ordinal

• Wrong: الطابق ثلاثة
• Right: الطابق الثالث
• Why: ثلاثة answers “how many?”; الثالث identifies the third item in an order.

Forgetting gender agreement

• Wrong: المرة الثاني
• Right: المرة الثانية
• Why: مرة is feminine, so its ordinal must be feminine too. English “second” gives no gender clue, but Arabic does.

Applying cardinal-number gender reversal

• Wrong: الصفحة الثالث because the learner remembers that three through ten reverse gender when counting
• Right: الصفحة الثالثة
• Why: Ordinals act like adjectives and match the noun. The reversal belongs to cardinal counting phrases such as ثلاث صفحات, not to ordinals.

Mixing definite and indefinite forms

• Wrong: الكتاب ثالث when you mean “the third book”
• Right: الكتاب الثالث
• Why: In the normal adjective construction, the noun and ordinal match in definiteness.

Copying English word order

• Wrong: الثالث الكتاب
• Right: الكتاب الثالث
• Why: The normal Arabic order is noun + ordinal. أول مرة is a separate, common construction; it does not license الثالث الكتاب.

Using the masculine second part with a feminine teen ordinal

• Wrong: الساعة الثانية عشر
• Right: الساعة الثانية عشرة
• Why: In ordinal compounds from eleventh to nineteenth, both components normally match the noun’s gender.

Usage Notes

Ordinals as standalone words

When the noun is obvious, the ordinal can stand alone: اخترت الثاني means “I chose the second one,” and وصلت الأولى means “the first one arrived” when the omitted noun is feminine. The gender still reflects the omitted noun or the person being described.

In lists and presentations, Arabic commonly uses adverbial forms: أولًا “first/firstly,” ثانيًا “second/secondly,” ثالثًا “third/thirdly.” These organize points rather than modify a noun: أولًا، نراجع الخطة. ثانيًا، نوزع المهام. “First, we review the plan. Second, we distribute the tasks.”

Recurring events

For “for the first/second/third time,” use للمرة الأولى / الثانية / الثالثة. The shorter أول مرة is also extremely common when introducing someone’s first experience. An indefinite phrase such as مرة ثانية often means “a second time” or simply “again.”

Modern Standard Arabic and dialects

The forms in this article are Modern Standard Arabic. Most spoken varieties retain recognizable forms such as أول, ثاني, and ثالث, but pronunciation, endings, and preferred constructions vary by region. Case endings are normally absent from everyday speech. Learn the standard written forms first, then notice the local pronunciation used by the speakers you follow.

Floors, dates, and labels

Ordinals appear after nouns in labels such as الطابق الخامس “the fifth floor” and الفصل السابع “chapter seven/the seventh chapter.” Building-floor numbering may not correspond exactly to the system familiar to an English speaker, so check local signage rather than treating “first floor” as a purely grammatical translation.

Dates can use a nominalized ordinal, especially in formal language: في الخامس من مايو “on the fifth of May.” Digits are also extremely common in real timetables, forms, and news writing, but you should still be able to read the value aloud in context.

Beyond the Basics / Advanced Use

Eleventh through nineteenth

Compound ordinals from 11th through 19th use two words. Both parts normally match the gender of the noun:

Position	Masculine	Feminine
eleventh	الحادي عشر	الحادية عشرة
twelfth	الثاني عشر	الثانية عشرة
thirteenth	الثالث عشر	الثالثة عشرة
fourteenth	الرابع عشر	الرابعة عشرة
fifteenth	الخامس عشر	الخامسة عشرة

The same pattern continues through التاسع عشر / التاسعة عشرة. Notice that “eleventh” begins with الحادي, not الأول. These compounds are written without a conjunction between the two parts.

Ordinals with the tens

For 21st and similar forms, Arabic joins the unit ordinal to the tens with و “and”:

• القرن الحادي والعشرون — the twenty-first century
• المادة الثانية والعشرون — the twenty-second article/item
• المركز الثالث والثلاثون — thirty-third place

In formal Arabic, the tens ending changes with case: العشرون may become العشرين, as in في القرن الحادي والعشرين “in the twenty-first century.” This is part of the case system, not a change in the ordinal’s basic meaning.

“Second-largest” and similar rankings

Arabic can place an ordinal before a superlative expression:

• ثاني أكبر مدينة — the second-largest city
• ثالث أهم سبب — the third most important reason

These are compact ranking expressions. Because the ordinal is part of a linked phrase before the noun, it does not take الـ in the same way as the post-noun adjective in المدينة الثانية. Treat the whole expression as a separate advanced pattern rather than changing ordinary noun + ordinal word order.

Meaningful indefinite forms

Indefinite ordinals do more than label textbook sequences. كتاب ثانٍ can mean “a second book” or “another book,” and فرصة ثانية can mean “a second chance.” Context determines whether the speaker is emphasizing exact order or the addition of another item.

Practice Tips

1. Learn each form as a gender pair. Say ثالث / ثالثة, رابع / رابعة, and so on. Then attach each pair to one masculine and one feminine noun: الدرس الثالث، الصفحة الثالثة.
2. Build contrast cards. Put a cardinal phrase on one side—ثلاثة طوابق “three floors”—and the corresponding ordinal phrase on the other—الطابق الثالث “the third floor.” This directly trains the difference between quantity and order.
3. Describe a real sequence. Number the chapters of a book, stops on a route, or tasks in your day. Use both the ordinary adjective pattern and recurring-event phrases: الفصل الأول، الفصل الثاني; للمرة الأولى، للمرة الثانية.

Related Concepts

• Prerequisite: Numbers 1–10 — supplies the basic number vocabulary from which most early ordinals are formed.
• Supporting concept: Adjective Agreement — explains why an ordinal follows its noun and matches gender and definiteness.
• Next step: Numbers 11–100 — helps with the tens and compound structures used in higher ordinals.