What is i'rab (al-i'rab)?
In one line
Definition
Key words in the Arabic
Understand it
I'rab is not one chapter of Arabic grammar. It is the heartbeat of Arabic grammar.
English-speaking students usually meet i'rab as the most complex topic in the language — the one to be survived. It is the opposite. The study of i'rab is the study of Arabic grammar itself, and without it there is no foundation to build on. It is the topic that demystifies Arabic: understand i'rab and you understand what the language is doing, and why. You begin it on your first day, and you are still studying it at an advanced level.
The subject is genuinely large. To hold all of it in one simple formula, we teach it as RICE.
R · I · C · E
| The question it answers | ||
|---|---|---|
| R | Role | What job is this ism doing in the sentence? |
| I | I'rab | Which state that role puts it in — rafa, nasab or jarr. |
| C | Category | What kind of ism it is. |
| E | Express | How that state is shown on the word. |
Read it across the top, then across the bottom: the role settles the i'rab, and the category settles how that i'rab is expressed.
Two sentences carry the whole system. The role of an ism dictates its i'rab — whether it will be rafa, nasab or jarr. The category of the ism governs how it expresses that i'rab. Every page in this section hangs on one of those four pillars.
I'rab (إِعْرَاب) means to make a thing plain — to express it clearly. That is exactly what it does: the end of a word changes, and the change makes plain the job that word is doing in its sentence or phrase.
You already say all three every day. One name, three endings, one English translation.
One name, three endings
| Where you say it | Transliteration | I'rab | |
|---|---|---|---|
| the shahadah | مُحَمَّدٌ رَسُولُ اللهِ | muhammadun | rafa |
| the tashahhud | أَنَّ مُحَمَّدًا رَسُولُ اللهِ | muhammadan | nasab |
| the salawat | صَلِّ عَلَى مُحَمَّدٍ | muhammadin | jarr |
The name never changes in English. In Arabic it changes three times, and each change is telling you what the word is doing in that sentence.
English does the same thing, but only on its pronouns — he came, I saw him, that is his. Say “his came to me” and it is wrong, though everyone knows who is meant. Arabic does this on every ism, not only on pronouns.
Two questions settle any i'rab, and they must be asked in this order. First: what role is this ism playing? The role dictates which of the three states it must be in. Second: what category of ism is it? The category dictates how that state is shown on the word. Role, i'rab, category, expression.
The three states
Every ism is in one of exactly three states of i'rab, and no more. Which one it must be in is decided by its role.
Role — the three groups
The roles are grouped by the state they produce: eight roles put an ism in rafa, twelve put it in nasab, and two put it in jarr.
Because the ending carries the role, Arabic can move its words about without losing the sense. نَصَرَ حَامِدٌ زَيْدًا and زَيْدًا نَصَرَ حَامِدٌ both say Hamid helped Zayd — the ـٌ and the ـًا decide who did what, not the order they stand in. English has to fix the order instead: change it, and “the mango ate Zayd” means something else entirely.
That freedom is not the same as order being meaningless. Arabic still has a normal order, and moving a word out of it is how the language gives emphasis or restriction — إِيَّاكَ نَعْبُدُ is “You alone we worship”, not simply “we worship You”. The order is free of the job of marking roles; it is not free of meaning.
But be careful how you read “the ending”. For most isms the state shows as a vowel on the last letter. For the dual, the two sound plurals and the five nouns it shows as a letter instead — مُسْلِمَانِ against مُسْلِمَيْنِ. And for a mabni word or an ism ending in a fixed alif, nothing shows at all, and the role has to be read from the word's position and from the sense. Which of the three happens is settled by the category, and that is the next question after the role.
How to spot it
In the Qur'an
In the language — فِي اللُّغَة
The word إِعْرَاب (i'rab) in everyday Arabic means making something plain, expressing it clearly.
أَعْرَبَ عَنْ رَأْيِهِ (a'raba 'an ra'yihi) — “he made his opinion plain”
As a grammatical term it means the change at the end of a word that makes the word's role plain. It is sometimes glossed as “to Arabise”, but that is a folk explanation rather than the meaning of the root.
Related terms
Common questions
Does every Arabic word change its ending?
No. Only mu'rab words move through the states. A large part of the language — pronouns, most particles, demonstratives, the past tense — is mabni and keeps one fixed ending, so its role has to be read from position instead.
Next in the guideاَلْمَرْفُوعَاتWhat are the marfu'at (al-marfu'at)? →Updated