A pleasurable feeling, usually felt in a wave or waves during sex, and usually achieved by physically stimulating the genitals. In the male body, it is typically accompanied by ejaculation, although not always.
It’s difficult to describe and different people feel different things, but most people experience a kind of gradual, tingly build up and then a release – kind of like a sneeze but bigger and better (and not in your nose).
Reaching an orgasm can be called a number of different things – e.g. reaching a climax / climaxing or coming / cumming.