Etymology
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Words related to class

*kele- (2)
*kelə-, Proto-Indo-European root meaning "to shout." Perhaps imitative.

It forms all or part of: acclaim; acclamation; Aufklarung; calendar; chiaroscuro; claim; Claire; clairvoyance; clairvoyant; clamor; Clara; claret; clarify; clarinet; clarion; clarity; class; clear; cledonism; conciliate; conciliation; council; declaim; declare; disclaim; ecclesiastic; eclair; exclaim; glair; hale (v.); halyard; intercalate; haul; keelhaul; low (v.); nomenclature; paraclete; proclaim; reclaim; reconcile.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit usakala "cock," literally "dawn-calling;" Latin calare "to announce solemnly, call out," clamare "to cry out, shout, proclaim;" Middle Irish cailech "cock;" Greek kalein "to call," kelados "noise," kledon "report, fame;" Old High German halan "to call;" Old English hlowan "to low, make a noise like a cow;" Lithuanian kalba "language."
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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.

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.

classism (n.)
"distinction of class," 1842, from class (n.) + -ism.
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.

classmate (n.)
"one of the same class at school or college," 1713, from class (n.) + mate (n.).
classroom (n.)

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

classy (adj.)
"pertaining to or characteristic of a (high) class," 1891, from class (n.) + -y (2). Related: Classily; classiness.
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]
first-class (adj.)
"of the highest class" with reference to some standard of excellence, 1837, from first (adj.) + class (n.). Specifically in reference to conveyances for travel, 1846. In reference to U.S. Mail, 1875.