1589, from L.L. climax (gen. climacis), from Gk. klimax "propositions rising in effectiveness," lit. "ladder," from base of klinein "to slope," from PIE base *klei- "to lean" (see
lean (v.)). The rhetorical meaning evolved in Eng. through "series of steps by which a goal is
achieved," to "escalating steps," to (1789) "high point," a usage credited by the OED "to popular ignorance." The verb is 1835, from the noun. The meaning "orgasm" is first recorded 1918, apparently coined by birth-control pioneer Marie Stopes, as a more accessible word than orgasm.
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