Etymology
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grammatical (adj.)

1520s, "of or pertaining to grammar," from French grammatical and directly from Late Latin grammaticalis "of a scholar," from grammaticus "pertaining to grammar" (see grammar). Related: Grammatically (c. 1400).

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category (n.)

1580s, in Aristotle's logic, "a highest notion," from French catégorie, from Late Latin categoria, from Greek katēgoria "accusation, prediction, category," verbal noun from katēgorein "speak against; to accuse, assert, predicate," from kata "down to" (or perhaps "against;" see cata-) + agoreuein "to harangue, to declaim (in the assembly)," from agora "public assembly" (from PIE root *ger- "to gather").

The Greek verb's original sense of "accuse" had weakened to "assert, name" by the time Aristotle applied katēgoria to his 10 classes of "expressions that are in no way composite," perhaps "things that can be named simply." Precisely what he meant by it "has been disputed almost from his own day till the present" [OED].

What, exactly, is meant by the word "category," whether in Aristotle or in Kant and Hegel, I must confess that I have never been able to understand. I do not myself believe that the term "category" is in any way useful in philosophy, as representing any clear idea. [Bertrand Russell, "A History of Western Philosophy," 1945]

The sense of "any very wide and distinctive class, any comprehensive class of persons or things" is from 1660s.

category should be used by no-one who is not prepared to state (1) that he does not mean class, & (2) that he knows the difference between the two .... [Fowler]
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sub-category (n.)

also subcategory, 1855, from sub- + category (n.).

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categorize (v.)

also categorise, "place in a category," 1705, from category + -ize. Related: Categorized; categorizing.

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assort (v.)

late 15c., "to distribute into groups or classes," from Old French assorter "to assort, match" (15c., Modern French assortir), from a- "to" (see ad-) + sorte "kind, category," from Latin sortem (nominative sors) "lot; fate, destiny; share, portion; rank, category; sex, class, oracular response, prophecy" (from PIE root *ser- (2) "to line up"). Related: Assorted; assorting.

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POSSLQ 

1979, acronym from person of opposite sex sharing living quarters; it never was an official category.

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-plex 

word-forming element, from Latin -plex, from PIE root *plek- "to plait." De Vaan writes, "Probably, duplex was the archetype of this category of compounds."

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demographic (adj.)

1882, "of or pertaining to demography," from demography + -ic. As a noun, by 1998, short for demographic group or category. Related: Demographical; demographically; demographer (1877).

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ungrammatical (adj.)

1650s, from un- (1) "not" + grammatical. Related: Ungrammatically.

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inflected (adj.)

1640s, "bent, curved," past-participle adjective from inflect (v.). Grammatical sense is from 1775.

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