- gravitation [grav΄i tā′shən]n.[ModL gravitatio: see GRAVITATE]1. the act, process, or fact of gravitating2. Physicsa) the force by which every mass or particle of matter, including photons, attracts and is attracted by every other mass or particle of matterb) the tendency of these masses or particles to move toward each othergravitationaladj.gravitationallyadv.
English World dictionary. V. Neufeldt. 2014.