Gravidate is an antiquated term for impregnate that is still commonly used in fetish circles. The term comes from the phrase “to make gravid,” or to make pregnant. It originated from the Latin term gravidus, which means “laden” or “pregnant,” or gravis, which translates to “heavy.”
The term gravid is most commonly used to refer to egg-laying animals, but the term gravidate is used with specific reference to humans.