Etymology
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classroom (n.)

also class-room, "room in which school lessons are taught," 1811, from class (n.) + room (n.).

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classless (adj.)

1874 in the social sense, "having or belonging to no class," from class (n.) in the "social order" sense + -less. As "lacking the sophistication of high class," by 1979. Related: Classlessly; classlessness.

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classify (v.)

"arrange in a class or classes, arrange according to common characteristics," 1782, from French classifier, from classe (see class (n.)) + -fier (see -fy). Related: Classified; classifying.

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classic (adj.)

1610s, "of or belonging to the highest class; approved as a model," from French classique (17c.), from Latin classicus "relating to the (highest) classes of the Roman people," hence, "superior," from classis (see class (n.)). Originally in English, "of the first class;" meaning "belonging to or characteristic of standard authors of Greek and Roman antiquity" is attested from 1620s.

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subclass (n.)
also sub-class, 1802, from sub- + class (n.).
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classification (n.)

1772, "action of classifying, act of forming a class or dividing into classes," noun of action from Latin stem of classify, or from French classification. Meaning "result of classifying" is from 1789.

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underclass (n.)
"subordinate social class," 1894, from under (adj.) + class (n.). A loan-translation of Swedish underklass.
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outclass (v.)

1870, originally in sports, "to beat (a rival) so completely as to put him out of the same class," from out- + class (n.).

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declasse (adj.)

"having lost one's place in the social order," 1887, from French déclassé, past participle of déclasser "to cause to lose class," from de-, privative prefix (see de-) + classer "to class," from classe (n.), from Latin classis  (see class (n.)). In italics in English until c. 1920; nativized form declassed is attested from 1873.

Fallen or put out of one's proper class or place or any definite and recognized position or rank in the social system: applied to persons who by misfortune or their own fault have lost social or business standing, and are not counted as part of any recognize class of society. [Century Dictionary, 1897]
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underclassman (n.)
"sophomore or freshman," 1869, American English, from under (adj.) + class (n.) in the school form sense + man (n.).
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