Arabic الـ marks a noun as definite: it identifies “the” particular person or thing, a known class, or something already established in the conversation. It is attached directly to the following word, and its spelling never changes for gender or number.
The deeper rule is that definiteness belongs to the whole noun phrase. The article may appear on a noun and its adjective, or definiteness may come from an iḍāfa, a possessive suffix, a demonstrative, a relative expression, or the surrounding discourse. Translating every English the mechanically will miss that system.
One invariant written form
The article is written الـ before masculine, feminine, singular, dual, and plural nouns alike.
| Number and gender | Indefinite | Definite |
|---|---|---|
| Masculine singular | كتاب | الكتاب |
| Feminine singular | سيارة | السيارة |
| Dual | كتابان | الكتابان |
| Nonhuman plural | كتب | الكتب |
| Human plural | طلاب | الطلاب |
Arabic has no separate word equivalent to English a/an. A bare count noun can be indefinite. In a fully inflected connected reading it may have tanwīn, but normal unvocalized writing does not display the nominative or genitive tanwīn.
وصل ضيف جديد.
waṣala ḍayfun jadīd.
A new guest arrived.
وصل الضيف الجديد.
waṣala ḍ-ḍayfu l-jadīd.
The new guest arrived.
The article begins with ا, whose initial vowel is pronounced when the word begins an utterance: الكتاب al-kitāb. In connected speech after a vowel, that vowel drops because it is hamzat al-waṣl: في الكتاب is fī l-kitāb, not fī al-kitāb.
الكتاب على المكتب.
al-kitābu ʿalā l-maktab.
The book is on the desk.
بحثت عن المفتاح في البيت.
baḥathtu ʿani l-miftāḥi fī l-bayt.
I looked for the key in the house.
The article must not be separated by a space. For more detail on its written shapes, see Definite-Article Spelling.
Moon letters and sun letters
Before a moon letter, the ل of the article is pronounced: القمر al-qamar, البيت al-bayt. Before a sun letter, the ل remains in spelling but assimilates in speech to the following consonant, which is doubled with shadda in full vocalization: الشمس ash-shams, الطالب aṭ-ṭālib.
| Class | Letters | Spelling | Pronunciation |
|---|---|---|---|
| Sun | ت ث د ذ ر ز س ش ص ض ط ظ ل ن | الشمس | ash-shams |
| Moon | ا ب ج ح خ ع غ ف ق ك م ه و ي | القمر | al-qamar |
يحضر الطالب اليوم.
yaḥḍuru ṭ-ṭālibu l-yawm.
The student is attending today.
رأيت الشمس قبل الغروب.
raʾaytu sh-shamsa qabla l-ghurūb.
I saw the sun before sunset.
English speakers often either pronounce every ل or delete it from the spelling. Keep the two levels apart: the spelling always contains الـ, while the pronunciation assimilates only before the fourteen sun letters.
A definite adjective repeats the article
An attributive adjective is part of the same noun phrase and agrees in definiteness. If the noun has الـ, its adjective also has الـ: الكتاب الجديد “the new book.” If the noun is indefinite, the adjective is indefinite: كتاب جديد “a new book.”
اشتريت كتابا جديدا للمقرر.
ʾishtaraytu kitāban jadīdan li-l-muqarrar.
I bought a new book for the course.
اشتريت الكتاب الجديد للمقرر.
ʾishtaraytu l-kitāba l-jadīda li-l-muqarrar.
I bought the new book for the course.
This repetition is not “two instances of the” in English. It is agreement: both words signal membership in one definite phrase. Compare الكتاب جديد “the book is new,” where جديد is an indefinite predicate, with الكتاب الجديد “the new book,” where it is an attributive adjective.
الكتاب جديد، لكن الغلاف قديم.
al-kitābu jadīdun, lakinna l-ghilāfa qadīm.
The book is new, but the cover is old.
Definiteness without an article on the head
The first noun of an iḍāfa cannot take الـ or tanwīn. The final dependent determines whether the whole phrase is definite. Thus كتاب طالب is “a student's book,” while كتاب الطالب is “the student's book/the book of the student.”
قرأت كتاب الطالب.
qaraʾtu kitāba ṭ-ṭālib.
I read the student's book.
Possessive suffixes also make a noun definite: كتابي means “my book,” so الـ is not added. A demonstrative combines with a definite noun in the phrase هذا الكتاب “this book.” Without the article, هذا كتاب is normally a complete identification sentence: “This is a book.”
هذا الكتاب مفيد.
hādhā l-kitābu mufīd.
This book is useful.
هذا كتاب مفيد.
hādhā kitābun mufīd.
This is a useful book.
كتابي على الطاولة.
kitābī ʿalā ṭ-ṭāwila(h).
My book is on the table.
A definite antecedent also licenses a definite relative description: الطالب الذي نجح “the student who passed.” The relative expression continues the already definite reference; it is not made definite by inserting another article before the relative pronoun.
Discourse and generic reference
Definiteness is not only visible grammar; it tracks shared knowledge. An indefinite noun can introduce a new referent, and a definite noun can refer back to it in the next sentence.
اشتريت كتابا أمس. الكتاب مفيد جدا.
ʾishtaraytu kitāban ʾams. al-kitābu mufīdun jiddan.
I bought a book yesterday. The book is very useful.
The second الكتاب is definite because the listener now knows which book is meant.
Arabic also uses the article for many generic classes where English uses a bare plural, and for names of languages in common object constructions.
الأسود حيوانات مفترسة.
al-ʾusūdu ḥayawānātun muftarisa(h).
Lions are predatory animals. (Generic class.)
أتعلم العربية في الجامعة.
ʾataʿallamu l-ʿarabiyyata fī l-jāmiʿa(h).
I am learning Arabic at the university.
There is no safe word-for-word equation “English has the, therefore Arabic has الـ.” First decide whether Arabic presents the whole phrase as identifiable, possessed, demonstrated, or generic.
Common Mistakes
Importing an indefinite article
❌ اشتريت واحد كتاب أمس.
Incorrect — wāḥid is not a general equivalent of English “a.”
✅ اشتريت كتابا أمس.
ʾishtaraytu kitāban ʾams.
I bought a book yesterday.
Omitting the article from an attributive adjective
❌ الكتاب جديد
Incorrect for the intended noun phrase “the new book”; this wording is the sentence “the book is new.”
✅ الكتاب الجديد
al-kitābu l-jadīd
The new book.
Putting the article on the first term of an iḍāfa
❌ قرأت الكتاب الطالب.
Incorrect — the iḍāfa head cannot take the article.
✅ قرأت كتاب الطالب.
qaraʾtu kitāba ṭ-ṭālib.
I read the student's book.
Copying English bare-plural generic usage
❌ أسود حيوانات مفترسة.
Incorrect for a general statement about the species — Arabic normally marks the generic class as definite.
✅ الأسود حيوانات مفترسة.
al-ʾusūdu ḥayawānātun muftarisa(h).
Lions are predatory animals.
Separating the article from its noun
❌ المفتاح في ال بيت.
Incorrect — the article is a written prefix, not a separate word.
✅ المفتاح في البيت.
al-miftāḥu fī l-bayt.
The key is in the house.
Key Takeaways
- الـ is one attached, invariant article for every gender and number.
- Its lām is written everywhere but assimilated in pronunciation before a sun letter.
- Definiteness belongs to the whole phrase, so an attributive adjective repeats the article.
- Iḍāfa, possessive suffixes, demonstratives, and prior mention can make a phrase definite without الـ on its head.
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Start learning Arabic →Related Topics
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- Indefiniteness and TanwīnA1 — Learn how Arabic expresses an indefinite noun phrase with no article and, in fully marked forms, tanwīn endings that ordinary prose usually hides.
- Languages, Days, Months, and MealsA2 — Learn the article conventions used with language names, weekdays, month names, and meals in formal Arabic.