English
adventitiously
From adventitious + -ly.
A compound of adventitious + -ly
Proto-Indo-European *gʷem- ‘to come, to step’
…
Latin adveniō ‘to arrive’
Latin adventus ‘arrival, coming, approach, advent’
Latin adventīcius ‘foreign, strange, accidental’
Medieval Latin adventītius ‘coming from abroad, extraneous’
English adventitious
Today it means
adv in an adventitious manner; sporadically.
Language periods are conventional ranges, not dates for this word.
Etymograph / adventitiously