Definition of classifier noun from the Oxford Advanced American Dictionary

 

classifier

 noun
noun
NAmE//ˈklæsəˌfaɪər//
 
(grammar)
 
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an affix or word that shows that a word belongs to a group of words with similar meanings. For example the prefix “un” is a classifier that shows the word is negative.
See the Oxford Advanced Learner's Dictionary entry: classifier