1. a final climactic stage; "their achievements stand as a culmination of centuries of development"
(hypernym) phase, stage
2. (astronomy) a heavenly body's highest celestial point above an observer's horizon
(hypernym) celestial point
(classification) astronomy, uranology
3. the decisive moment in a novel or play; "the deathbed scene is the climax of the play"
(hypernym) moment, minute, second, instant
4. a concluding action
(synonym) completion, closing, windup, mop up
(hypernym) termination, ending, conclusion
(derivation) culminate, climax