Definition of adventitious in English:

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Pronunciation: /ˌadvenˈtiSHəs/


1Happening or carried on according to chance rather than design or inherent nature: my adventures were always adventitious, always thrust on me
More example sentences
  • Then, as if in tribute to the adventitious nature of idea generation, the solution came to him in his sleep.
  • Nowhere was this adventitious attitude to life more evident than in the rural music scene.
  • The influence a writer can exert is purely adventitious.
1.1Coming from outside; not native: the adventitious population
More example sentences
  • No adventitious spooks are required to account for this-the ‘laws’ of biochemistry and physics are spooky enough.
  • One possible source for this high frequency dispersion could be trace amounts of adventitious oxygen or contributions from iron.
  • Indeed, it has been proposed that these adventitious materials play a role in in meso crystallization.
1.2 Biology Formed accidentally or in an unusual anatomical position: propagation of sour cherries by adventitious shoots
More example sentences
  • It has previously been shown that adventitious organogenesis and embryogenesis could occur in parallel from in vitro-cultured tissues of Helianthus.
  • In adventitious embryony, the embryo develops directly from nucellar or chalazal tissue without an intervening gametophyte stage.
  • Flight-feather molt categories were symmetric, adventitious, and juvenal.
1.3 Botany (Of a root) growing directly from the stem or other upper part of a plant.
Example sentences
  • The total number of primary adventitious roots per plant was closely correlated with corm dry weight.
  • The young parasite then develops a tubercle, with adventitious roots and a shoot.
  • Oxygen transport from shoot through adventitious roots has been visualized directly.



Example sentences
  • That is, idiosyncratic behavior may develop adventitiously.
  • Leafy shoots are borne adventitiously on the dorsal side of the long, creeping root.
  • On the facts as we understand them, it was an offence adventitiously committed.


Early 17th century: from Latin adventicius 'coming to us from abroad' (from advenire 'arrive') + -ous (see also -itious2).

Words that rhyme with adventitious

Aloysius, ambitious, auspicious, avaricious, capricious, conspicuous, delicious, expeditious, factitious, fictitious, flagitious, judicious, lubricious, malicious, Mauritius, meretricious, nutritious, officious, pernicious, propitious, repetitious, seditious, siliceous, superstitious, suppositious, surreptitious, suspicious, vicious

For editors and proofreaders

Syllabification: ad·ven·ti·tious

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