What is "evagation"

Evagation \Ev`a*ga"tion\, n. [L. evagatio, fr. evagari to wander forth: cf. F. ['e]vagation. See Vagary.] A wandering about; excursion; a roving. [R.]
--Ray.

"action of wandering," 1650s, from French évagation, from Latin evagationem (nominative evagatio), noun of action from past participle stem of evagari, from assimilated form of ex- (see ex-) + vagari, from vagus "roving, wandering" (see vague).

n. A wandering about; excursion; a rove.