IPA: /ɪˈvɛkʃən/
KK: /ɪˈvɛkʃən/
A disturbance in the orbit of the moon caused by the gravitational pull of the sun.
The evection of the moon affects its position in the sky.
Evection is derived from "e-" (meaning out) and "vectio" (from Latin, meaning to carry). The term originally referred to the act of carrying something out or away, particularly in an astronomical context where it describes the apparent motion of a planet away from the sun.
Think of 'carrying out' ('vectio') something from a place ('e-') — that's why evection refers to the apparent movement of a planet away from the sun.