The Collaborative International Dictionary of English v.0.48:

Aspiration \As`pi*ra"tion\, n. [L. aspiratio, fr. aspirare: cf.
   F. aspiration.]
   1. The act of aspirating; the pronunciation of a letter with
      a full or strong emission of breath; an aspirated sound.
      [1913 Webster]

            If aspiration be defined to be an impetus of
            breathing.                            --Wilkins.
      [1913 Webster]

   2. The act of breathing; a breath; an inspiration.
      [1913 Webster]

   3. The act of aspiring of a ardently desiring; strong wish;
      high desire. "Aspirations after virtue." --Johnson.
      [1913 Webster]

            Vague aspiration after military renown. --Prescott.
      [1913 Webster]

WordNet (r) 3.0 (2006):

aspiration
    n 1: a will to succeed
    2: a cherished desire; "his ambition is to own his own business"
       [syn: ambition, aspiration, dream]
    3: a manner of articulation involving an audible release of
       breath
    4: the act of inhaling; the drawing in of air (or other gases)
       as in breathing [syn: inhalation, inspiration,
       aspiration, intake, breathing in]