The Collaborative International Dictionary
Adventitious \Ad`ven*ti"tious\, a. [L. adventitius.]
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Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.
To things of great dimensions, if we annex an adventitious idea of terror, they become without comparison greater.
--Burke. (Nat. Hist.) Out of the proper or usual place; as, adventitious buds or roots.
(Bot.) Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive; -- applied to foreign plants.
(Med.) Acquired, as diseases; accidental. [1913 Webster] -- Ad`ven*ti"tious*ly, adv. -- Ad`ven*ti"tious*ness, n.
Wiktionary
adv. in an adventitious manner; sporadically.
Usage examples of "adventitiously".
Until now, as it had grown and matured, it had lived adventitiously, drifting with the currents, eating whatever food came its way.
The same right eye had been adventitiously reblackened by Dominique-Louise.