The Collaborative International Dictionary of English v.0.48:

Dive \Dive\, v. i. [imp. & p. p. Dived, colloq. Dove, a
   relic of the AS. strong forms de['a]f, dofen; p. pr. & vb. n.
   Diving.] [OE. diven, duven, AS. d?fan to sink, v. t., fr.
   d?fan, v. i.; akin to Icel. d?fa, G. taufen, E. dip, deep,
   and perh. to dove, n. Cf. Dip.]
   1. To plunge into water head foremost; to thrust the body
      under, or deeply into, water or other fluid.
      [1913 Webster]

            It is not that pearls fetch a high price because men
            have dived for them.                  --Whately.
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   Note: The colloquial form dove is common in the United States
         as an imperfect tense form.
         [1913 Webster]

               All [the walruses] dove down with a tremendous
               splash.                            --Dr. Hayes.
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               When closely pressed it [the loon] dove . . . and
               left the young bird sitting in the water. --J.
                                                  Burroughs.
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   2. Fig.: To plunge or to go deeply into any subject,
      question, business, etc.; to penetrate; to explore.
      --South.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dove \Dove\ (d[u^]v), n. [OE. dove, duve, douve, AS. d[=u]fe;
   akin to OS. d[=u]ba, D. duif, OHG. t[=u]ba, G. taube, Icel.
   d[=u]fa, Sw. dufva, Dan. due, Goth. d[=u]b[=o]; perh. from
   the root of E. dive.]
   1. (Zool.) A pigeon of the genus Columba and various
      related genera. The species are numerous.
      [1913 Webster]

   Note: The domestic dove, including the varieties called
         fantails, tumblers, carrier pigeons, etc., was
         derived from the rock pigeon (Columba livia) of
         Europe and Asia; the turtledove of Europe, celebrated
         for its sweet, plaintive note, is Columba turtur or
         Turtur vulgaris; the ringdove, the largest of
         European species, is Columba palumbus; the Carolina
         dove, or Mourning dove, is Zenaidura macroura; the
         sea dove is the little auk (Mergulus alle or Alle
         alle). See Turtledove, Ground dove, and Rock
         pigeon. The dove is a symbol of peace, innocence,
         gentleness, and affection; also, in art and in the
         Scriptures, the typical symbol of the Holy Ghost.
         [1913 Webster]

   2. A word of endearment for one regarded as pure and gentle.
      [1913 Webster]

            O my dove, . . . let me hear thy voice. --Cant. ii.
                                                  14.
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   3. a person advocating peace, compromise or conciliation
      rather than war or conflict. Opposite of hawk.
      [PJC]

   Dove tick (Zool.), a mite (Argas reflexus) which infests
      doves and other birds.

   Soiled dove, a prostitute. [Slang] Dovecot

WordNet (r) 3.0 (2006):

dove
    n 1: any of numerous small pigeons
    2: someone who prefers negotiations to armed conflict in the
       conduct of foreign relations [syn: dove, peacenik] [ant:
       hawk, war hawk]
    3: a constellation in the southern hemisphere near Puppis and
       Caelum [syn: Columba, Dove]
    4: flesh of a pigeon suitable for roasting or braising; flesh of
       a dove (young squab) may be broiled [syn: squab, dove]
    5: an emblem of peace