Ijmo‘ — arab tilidagi "ajmaa" fe'lining masdari bo‘lib, bu so‘zning ikki ma’nosi bor: 1) biror narsani belgilash, qat’iy qaror qilish; 2) biror narsa ustida kelishib olish.

Ijma‟ is the verbal noun of the Arabic word Ajmaa, which has two meanings: 1) to determine, 2) to agree upon something.

Usul al-fiqh kitoblarida ijmaning ko‘plab turlari muhokama qilinadi. Ulardan ba’zilari: ijmai ummah, ijmai mujtahidin, ijmai ahli bayt, ijmai Madina va ijmai as-sahoba. Ijmai as-sahoba – bu yagona qat’iy va hammaning kelishgan holda tan olgan turidir.

There are many types of Ijma‟ discussed in the books of Usul al-Fiqh. Some of these are; Ijma‟ al Ummah, Ijma‟ al Mujtahideen, Ijma‟ ahlel Bayt, Ijma al Madinah and Ijma‟ as-Sahabah. Ijma‟ as-Sahabah is the only one that is definitive and agreed upon.

Agar Sahoba (ra) Payg'ambar (s.a.v.) vafotidan keyin, Qur'on va Sunnatda hukm bo'lmagan masalada, o'zaro hech qanday ixtilofsiz bir yechimga bir ovozdan kelishsalar, bu kelishuv dalil hisoblanadi. Bu kelishuv Muhammad (s.a.v.) ning ularning hammasi biladigan, lekin to'g'ridan-to'g'ri hadis shaklida bizgacha yetib kelmagan biror ta'limotiga asoslangan bo'lishi kerak. Shuning uchun Ijmo' as-Sahoba Sunnatning o'zi haqida dalolat beradi.

If the Sahabah (ra) after the death of the Prophet (saw) were to agree unanimously upon a solution to a problem without any dissent amongst each other, in the absence of a ruling from the Qur‟an and Sunnah, then this agreement is considered to be a Daleel. This agreement must have been based upon some teaching of Mohammed (saw) of which they all knew, but which did not reach us directly in the form of Hadith. Therefore, Ijma‟ as-Sahabah is an indication of Sunnah itself.