1. (noun)climax, flood tide the highest point of anything conceived of as growing or developing or unfolding "the climax of the artist's career"; "in the flood tide of his success"
2. (noun)climax, culmination the decisive moment in a novel or play "the deathbed scene is the climax of the play"
3. (noun)orgasm, climax, sexual climax, coming the moment of most intense pleasure in sexual intercourse
4. (noun)climax the most severe stage of a disease