1. To be in harmony or to agree or match almost exactly: It seems that Jim's ideas correspond with his wife's.

Bill's professor said that when the ideas of a speaker correspond to the thinking of those of the audience, then communication is successful.

2. To be similar: The fins of fish are said to correspond to the wings of birds.
3. To exchange messages with another person or to write letters to other people: Although Crystal often traveled around the world as a reporter, she and her personal physician often corresponded whenever she needed medical advice.

Over the decades, Grace's mother was usually corresponding monthly with her six children and their families because they were living far away in other parts of the country.