Definite and Indefinite in Arabic: How 'The' and 'A' Work

English uses "the" for known things and "a" for unspecified ones. Arabic handles the same idea with a simpler tool: a definite article, and a lack of one.

The definite article: ال

Adding ال (al-) to the beginning of a noun makes it definite. So كتاب (kitab) is "a book" and الكتاب (al-kitab) is "the book". There is no separate word for "a" or "an" — an unmarked noun is simply indefinite.

Adjectives must agree in definiteness

In Arabic, an adjective agrees with its noun not only in gender and number but also in definiteness. If the noun takes ال, so does the adjective.

• كتاب جديد — kitab jadid — "a new book"
• الكتاب الجديد — al-kitab al-jadid — "the new book"

Noun plus adjective versus a full sentence

This leads to a useful trick. Compare:

• الكتاب الجديد — al-kitab al-jadid — "the new book" (a phrase)
• الكتاب جديد — al-kitab jadid — "the book is new" (a sentence)

When the adjective has no ال but the noun does, the pair forms a complete sentence, with an implied "is". It's an elegant feature, but one that surprises English speakers.

Proper nouns and names

Names of people are already definite, so they don't take ال. Some country and city names take the article and some don't: القاهرة (al-Qahira, Cairo) has it, while دمشق (Dimashq, Damascus) doesn't. There's no rule to predict this, so it must be learned with the name.

The "idafa" and definiteness

In the possessive construction, only the last noun carries the article. To say "the teacher's book", Arabic says "book the-teacher": كتاب المعلم (kitab al-mu'allim). The whole phrase counts as definite thanks to the final noun.

Common beginner mistakes

• Adding ال to both nouns in an idafa phrase.
• Forgetting to put ال on the adjective as well as the noun.
• Trying to translate English "a" with the word for "one".
• Expecting names of countries to follow one rule.

Practice

1. Take five nouns and write them indefinite and definite.
2. Add a matching adjective to each, in both forms.
3. Turn each noun-adjective phrase into a sentence by dropping ال from the adjective.
4. Say each out loud, keeping the sun and moon letters in mind.

Look up nouns and adjectives with English Arabic Dictionary →