The correct term is climax , always with tilde . It means boom, heyday, peak or critical moment, culmination. It can also mean orgasm.
Climax error . See orgasm , acmé .
CLIMAX 1 . in sexual intercourse, orgasm or point of greater arousal, which coincides with ejaculation. 2 . Highest moment 3. in literature, theatre and film (and even in music) : the most intense point of a work