Definition of adventition in English:

adventition

noun

rare
  • The action or fact of occurring adventitiously; extrinsic addition or influence; accidental or incidental occurrence.

Origin

Mid 17th century; earliest use found in Owen Felltham (?1602–1668), essayist and poet. Probably alteration of advention after adventitious.

Pronunciation:

adventition

/ˌadv(ə)nˈtɪʃn//ˌadvɛnˈtɪʃn/