Definition of classifiers:
(n) :
Someone who classifies.
(n) :
(computing) A program or algorithm that classifies.
(n) :
A machine that separates particles or objects of different size or density.
(n) :
(linguistics) A word or morpheme used in some languages (such as CJKV languages and American Sign Language), in certain contexts (such as counting), to indicate the semantic class to which something belongs.
(n) :
(object-oriented programming) A metaclass used to group other entities having common features.