The إضافة (idaafa) is a grammatical construction that links two nouns together to express possession, association, or specification. It is equivalent to "of" or possessive "'s" in English. For example, "the student's book" or "the book of the student" would both be expressed as a single idaafa construction: كِتَابُ الطَّالِبِ.
Structure and Rules
- The first noun is called المضاف (the possessed/annexed). It takes a case ending based on its role in the sentence but never takes ال or tanween.
- The second noun is called المضاف إليه (the possessor). It is always in the genitive case (مجرور).
- The idaafa as a whole takes its definiteness from the second noun. If المضاف إليه is definite, the entire construction is definite.
Examples
- بَابُ المَسْجِدِ — The door of the mosque (definite idaafa).
- كِتَابُ عِلْمٍ — A book of knowledge (indefinite idaafa).
- مُعَلِّمُ اللُّغَةِ العَرَبِيَّةِ — The teacher of the Arabic language (chain idaafa).
Important Notes
You can chain multiple idaafas together: بَابُ مَسْجِدِ المَدِينَةِ (the door of the mosque of the city). Each noun after the first is genitive, and the construction derives its definiteness from the very last noun in the chain.
A common mistake is adding ال to the مضاف — this is almost never allowed in a true idaafa. If you need to add an adjective to the مضاف, it comes after the entire idaafa construction and agrees with the مضاف: كِتَابُ الطَّالِبِ الجَدِيدُ (the student's new book — الجديد describes كتاب). Context and agreement help clarify which noun the adjective modifies.