evection
Concise Oxford English Dictionary © 2008 Oxford University Press:
evection /ɪˈvɛkʃ(ə)n/
▶noun Astronomy regular variation in the eccentricity of the moon's orbit around the earth, caused mainly by the sun's attraction.
– origin C17 (in the sense ‘elevation, exaltation’): from L. evectio(n-), from evehere ‘carry out or up’.
'evection' also found in these Oxford entries:

