[Gr. ἔκβασις, f. stem of ἐκβαίνειν to go out, digress.] See quot. (Craig’s explanation, copied in later Dicts., appears to be merely a guess. In sense ‘digression’ the word appears in late Lat.)

1

1706.  Phillips, Ecbasis, a going out, an Event; also a Rhetorical Figure call’d Digression.

2

1847.  Craig, Ecbasis, in Rhetoric, a figure in which the orator treats of things according to their events or consequences.

3