the moment during sexual activity when feelings of sexual pleasure are at their strongestto achieve/reach orgasmto have an orgasmOxford Collocations Dictionaryadjectivefemale,male,multiple,…verb + orgasmachieve,have,reach,…Seefull entryWord Originlate 17th cent.: from French orgasme, or from modern Latin orgasmus, from Greek orgasmos, from organ ‘swell or be excited’.
See orgasm in the Oxford Advanced American Dictionary