word class
Definition - One of several modern names for what was traditionally called a part of speech, i.e. one of the set of grammatical categories to which words can be assigned.

Example -
The black in black cat is a member of the word class adjective.

Etymology -
The term was coined as a loan translation of the German wortklasse.

Oxford English Dictionary -
Its first citation (and perhaps its first appearance in published English) is from 1914 in Leonard Bloomfield's Introduction to the Study of Language, where it appeared as a title.
(L. Bloomfield, Introd. Study Lang. iv. 108)

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