Etymology
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lineament (n.)

early 15c., liniament, "distinctive feature of the body, outline," from Latin lineamentum "contour, outline; a feature," literally "a line, stroke, mark," from lineare "to reduce to a straight line" (here apparently in an unrecorded sense "trace lines"), from linea "string, thread, line" (see line (n.)). Figurative sense of "a characteristic" is attested from 1630s.

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lineate (adj.)
"marked with lines," 1640s, from Latin lineatus, past participle of lineare in an unrecorded sense "trace lines" (see lineament).
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lineate (v.)
"to mark with lines," 1550s, from Latin lineatus, past participle of lineare in an unrecorded sense "trace lines" (see lineament). Related: Lineated; lineating.
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lineation (n.)

late 14c., "the act of drawing lines," from Latin lineationem (nominative lineatio) "a drawing of a line, the making in a straight line," noun of action from past-participle stem of lineare in an unrecorded sense "trace lines" (see lineament). Meaning "a marking by lines" is from 1540s.

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