"Evection" is a term primarily used in astronomy, which refers to the periodic variation in the position of the Moon due to the perturbations caused by the Sun's gravitational pull on the Moon's eccentric orbit around the Earth. Some of the synonyms for evection include perturbation, deviation, deflexion, and aberration. Each of these words shares the idea of a deviation or disturbance from a regular or expected path. Other synonyms of evection include distortion, fluctuation, variation, and quirk. While evection may be a technical term used primarily in the field of astronomy, it is useful to know some related synonyms for discussions or writings that may involve similar concepts.