Adventitious

Etymology
From adventicius:, from advenio:.

Adjective

 * 1) From an external source; not innate or inherent, foreign.
 * 2) Accidental, additional, appearing casually.
 * 3)  Not congenital; acquired.
 * 4)  Developing in an unusual place or from an unusual source.

Synonyms

 * extrinsic
 * accidental, spontaneous, sporadic
 * acquired

Derived terms

 * adventitiously
 * adventitiousness

Related terms

 * advent
 * adventitial
 * adventive
 * adventively

Thesaurus
accessory; accidental; additional; adscititious; aleatory; appurtenant; ascititious; auxiliary; casual; causeless; chance; chancy; circumstantial; collateral; conditional; contingent; destinal; dicey; extra; fatal; fatidic; fluky; fortuitous; iffy; incidental; indeterminate; inessential; nonessential; occasional; provisional; risky; secondary; subsidiary; superadded; superfluous; supervenient; supplemental; supplementary; uncaused; undetermined; unessential; unexpected; unforeseeable; unforeseen; unlooked-for; unpredictable