The Collaborative International Dictionary of English v.0.48:

Cultivate \Cul"ti*vate\ (k?l"t?-v?t), v. t. [imp. & p. p.
   Cultivated (-v?`t?d); p. pr. & vb. n. Cultivating
   (-v?`-t?ng).] [LL. cultivatus, p. p. of cultivare to
   cultivate, fr. cultivus cultivated, fr. L. cultus, p. p. of
   colere to till, cultivate. Cf. Colony.]
   1. To bestow attention, care, and labor upon, with a view to
      valuable returns; to till; to fertilize; as, to cultivate
      soil.
      [1913 Webster]

   2. To direct special attention to; to devote time and thought
      to; to foster; to cherish.
      [1913 Webster]

            Leisure . . . to cultivate general literature.
                                                  --Wordsworth.
      [1913 Webster]

   3. To seek the society of; to court intimacy with.
      [1913 Webster]

            I ever looked on Lord Keppel as one of the greatest
            and best men of his age; and I loved and cultivated
            him accordingly.                      --Burke.
      [1913 Webster]

   4. To improve by labor, care, or study; to impart culture to;
      to civilize; to refine.
      [1913 Webster]

            To cultivate the wild, licentious savage. --Addison.
      [1913 Webster]

            The mind of man hath need to be prepared for piety
            and virtue; it must be cultivated to the end.
                                                  --Tillotson.
      [1913 Webster]

   5. To raise or produce by tillage; to care for while growing;
      as, to cultivate corn or grass.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cultivate
    v 1: foster the growth of
    2: prepare for crops; "Work the soil"; "cultivate the land"
       [syn: cultivate, crop, work]
    3: teach or refine to be discriminative in taste or judgment;
       "Cultivate your musical taste"; "Train your tastebuds"; "She
       is well schooled in poetry" [syn: educate, school,
       train, cultivate, civilize, civilise]
    4: adapt (a wild plant or unclaimed land) to the environment;
       "domesticate oats"; "tame the soil" [syn: domesticate,
       cultivate, naturalize, naturalise, tame]