Definition of adventitious in English:


Line breaks: ad¦ven|ti¦tious
Pronunciation: /ˌadv(ə)nˈtɪʃəs


  • 1Happening as a result of an external factor or chance rather than design or inherent nature: adventitious similarities
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    • 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.
    unplanned, unpremeditated, accidental, unintentional, unintended, unexpected, unforeseen, involuntary, chance, fortuitous, serendipitous, coincidental, casual, random, fluky, unlooked-for, unhoped-for, not bargained for, out of the blue, without warning
    rare aleatory
  • 1.1Coming from outside; not native: the adventitious population
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    • 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: adventitious lobes may appear between the primaries
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    • 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, shoot, etc.) produced in an unusual part of a plant.
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    • 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.



More 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).

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