WordReference Random House Unabridged Dictionary of American English © 2017
in•ad•vert•ence  (in′əd vûrtns),USA pronunciation n. 
  1. the quality or condition of being inadvertent;
    heedlessness.
  2. the act or effect of inattention;
    an oversight.
  • Medieval Latin inadvertentia. See inadvertency, -ence
  • 1560–70

WordReference Random House Learner's Dictionary of American English © 2017
in•ad•vert•ent /ˌɪnədˈvɜrtənt/USA pronunciation   adj. 
  1. unintentional:an inadvertent insult.
  2. not attentive:He was inadvertent and knocked over his glass.
in•ad•vert•ence, n. [uncountable]
in•ad•vert•ent•ly, adv.: I inadvertently overheard her conversation.See -vert-.

WordReference Random House Unabridged Dictionary of American English © 2017
in•ad•vert•ent  (in′əd vûrtnt),USA pronunciation adj. 
  1. unintentional:an inadvertent insult.
  2. not attentive;
    heedless.
  3. of, pertaining to, or characterized by lack of attention.
in′ad•vertent•ly, adv. 
  • 1645–55; abstracted from inadvertence, inadvertency; see -ent
    • 2.See corresponding entry in Unabridged inattentive.
    • 3.See corresponding entry in Unabridged thoughtless, careless, negligent.


Collins Concise English Dictionary © HarperCollins Publishers::

inadvertence /ˌɪnədˈvɜːtəns/, inadvertency n
  1. lack of attention; heedlessness
  2. an instance or an effect of being inadvertent; oversight; slip



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