culmination (n.)

1630s, 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"). Originally a term in astronomy/astrology; figurative use is from 1650s.