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culmination (n.)

1630s, in astronomy/astrology, "position of a heavenly body when it is on the meridian," from French culmination, noun of action from past participle stem of Late Latin culminare "to top, to crown," from Latin culmen (genitive culminis) "top, peak, summit, roof, gable," also used figuratively, contraction of columen "top, summit" (from PIE root *kel- (2) "to be prominent; hill"). Figurative sense of "highest point or summit" is from 1650s.