Source : Webster's Revised Unabridged Dictionary (1913)

Inadvertence \In`ad*vert"ence\; pl. {-ces}, Inadvertency
\In`ad*vert"en*cy\; pl. {-cies}, n. [Cf. F. inadvertance.]
   1. The quality of being inadvertent; lack of heedfulness or
      attentiveness; inattention; negligence; as, many mistakes
      proceed from inadvertence.

            Inadvertency, or want of attendance to the sense and
            intention of our prayers.             --Jer. Taylor.

   2. An effect of inattention; a result of carelessness; an
      oversight, mistake, or fault from negligence.

            The productions of a great genius, with many lapses
            an inadvertencies, are infinitely preferable to
            works of an inferior kind of author which are
            scrupulously exact.                   --Addison.

   Syn: Inattention; heedlessness; carelessness; negligence;
        thoughtlessness. See {Inattention}.

Source : WordNet®

inadvertence
     n 1: an unintentional omission resulting from failure to notice
          something [syn: {oversight}]
     2: the trait of forgetting or ignoring your responsibilities
        [syn: {unmindfulness}, {heedlessness}, {inadvertency}]
        [ant: {mindfulness}, {mindfulness}]