Definition of evection
1 : perturbation of the moon's motion in its orbit due to the attraction of the sun
2 in certain filamentous algae : displacement of the base of a new branch with respect to its parent cell so as to result in apparent dichotomy
evectional\-shənəl, -shnəl\ adjective
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Origin and Etymology of evection
Latin evection-, evectio act of going up, from evectus (past participle of evehere to carry out, raise up, from e- + vehere to carry) + -ion-, -io -ion
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