the moment of most intense pleasure in sexual intercourse
"After hours of intimacy, they finally reached orgasm together at the peak of their passion."
A spasm or sudden contraction.
"The intense electrical shock caused a violent orgasm of muscle fibers across his entire back."
In plain English: An orgasm is the intense physical feeling of pleasure that happens when your body releases sexual tension all at once.
"She was surprised to learn that he had an intense orgasm during their first kiss, which turned out to be more than just physical touch for them both. Wait no, let me correct that with a simpler and clearer example sentence: The unexpected surprise made her experience a sudden rush of pleasure known as an orgasm without any prior warning or buildup at all. No wait again here is the best version using only everyday meaning in one simple natural sentence: Many people believe that reaching this peak moment of intense physical pleasure marks the end of sexual activity for them."
To have an orgasm.
"She quickly recovered from her intense moment of pleasure after she had orgasmed during the passionate encounter."
The word "orgasm" entered English in the early 20th century via French and New Latin. It originally derived from an Ancient Greek term meaning a physical swelling or excitement caused by fluids.