مَعْرِفَةٌ

a subst. [signifying Knowledge, cognition, cognizance, or acquaintance; &c.: as such having for its plural مَعَارِفُ, meaning sorts of knowledge:] from عَرَفَهُ signifying as explained in the beginning of this article: (Msb:) or a verbal noun therefrom. (S, O, K.)

See also مَعْرَفٌ, last sentence but one.

[In grammar, A determinate noun; opposed to نَكِرَةٌ.]