KHABAR MUTAWATIR خبر متواتر
A term used for a tradition which is handed down by very many distinct chains of narrators, and which has been always accepted as authentic and genuine, no doubt over having been raised against it.
Syud Ahmad Khan says all learned Muslims of every period have declared the Qur’an is the only Hadis Mutawatir, but some have declared certain Ahadis also to be Mutawatir, the number of such not exceeding five. (Essay on the Traditions, p. 15.) [TRADITIONS.]

Based on Hughes, Dictionary of Islam