e·vec·tion 
(ĭ-vĕkshən)
(ĭ-vĕkshən)n.
Solar perturbation of the lunar orbit.
[Latin ēvectiō, ēvectiōn-, a going up, from ēvectus, past participle of ēvehere, to raise up : ē-, ex-, up from; see EX- + vehere, to carry; see wegh- in the Appendix of Indo-European roots.]
e·vection·al adj.