English
adventious
From advention + -ous.
Formed from advention + -ous
Proto-Indo-European *gʷem- ‘to come, to step’
…
Proto-Italic *gʷəniō ‘to come’
Latin veniō ‘come’
Latin adveniō ‘to arrive’
Medieval Latin advention ‘addition’
English advention
Today it means
adj adventitious.
Language periods are conventional ranges, not dates for this word.
Etymograph / adventious