acme

noun5

1. •
   A high point: the highest point of any range, the most developed stage of any process, or the culmination of any field or historical period.

   • The Latin tong, euen whan it was, as the Grecians say, in ακμη, that is, at the hiest pitch of all perfitenesse. — 1570
2. •
   A paragon: a person or thing representing such a high point.

   • The few words of advice she gave him as to escaping political embarrassments, struck him as the acme of wisdom, and as indicating an interest in his well-being of the kindest description;... — 1842
3. •
   (rare) Full bloom or reproductive maturity.

   • He must be one that can instruct your youth, And keep your acme in the state of truth — 1625
4. •
   (euphemistic) Sexual orgasm.

   • [He] then holds back his own climax for another ten or fifteen minutes of active copulation until his mate signals him that she is about to reach her acme; then they both ecstatically erupt together. — 1963
5. •
   Synonym of crisis, the decisive moment in the course of an illness.

noun1

1. •
   A 29° trapezoidal threading used for various fittings and adapters.