Al-Idāfah means:Association of an ism with another one, in order to affect its definition or to specify its meaning.

Al-Idāfah consists of two words following eachother, the first one is called mudāf and the other one is called mudāf ilayh. Their fields of use include (but is not limited to):

Example of an idāfah:

"The book of Bilāl"

Specifications for

  1. Mudāf does neither carry tanwīn nor alif lām at-ta“reef.
  2. Mudāf ilayh is always majroor.


"The soorah of sincerity" (a chapter of the qur'an is called a soorah)

"The women's soorah"
So mudāf ilayh is majroor, but why does mudāf always seem to be marfoo`?Because the fundamental rule for asmā' is that they are marfoo`. In the following example the word "umm" is mudāf to "bilāl" though majroor - because it's mudāf ilayh to "bayt" at the same time:

"Bilāls mothers house"

We say that mudāf is "ism nakirah" due to its lack of , but when looking at the actual meaning it should be considered ma`rifah if its mudāf ilayh is ma`rifah.

As a similtude in english, we may say "The book", "Your book", and "A computer's book".
    The book is considered definite in the first two sentences, in the first because of "the", and in the second one because it is owned by "your" (which is definite), even though it lacks "the". In the third sentence "book" is indefinite due to "a computer" being indefinite.

"This is a page of a book"

"This is the page of the book"