The Collaborative International Dictionary of English v.0.48:

Culture \Cul"ture\, v. t. [imp. & p. p. Cultured (-t?rd; 135);
   p. pr. & vb. n. Culturing.]
   To cultivate; to educate.
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         They came . . . into places well inhabited and
         cultured.                                --Usher.
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The Collaborative International Dictionary of English v.0.48:

Cultured \Cul"tured\ (k?l"t?rd), a.
   1. Under culture; cultivated. "Cultured vales." --Shenstone.
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   2. Characterized by mental and moral training; disciplined;
      refined; well-educated.
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            The sense of beauty in nature, even among cultured
            people, is less often met with than other mental
            endowments.                           --I. Taylor.
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            The cunning hand and cultured brain.  --Whittier.
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WordNet (r) 3.0 (2006):

cultured
    adj 1: marked by refinement in taste and manners; "cultivated
           speech"; "cultured Bostonians"; "cultured tastes"; "a
           genteel old lady"; "polite society" [syn: civilized,
           civilised, cultivated, cultured, genteel,
           polite]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "cultured":
   abstruse, advanced, ameliorated, beautified, bettered, civilized,
   converted, cultivated, dainty, deep, delicate, developed,
   discriminating, distingue, educated, elegant, embellished,
   encyclopedic, enhanced, enlightened, enriched, erudite, fastidious,
   fine, genteel, gentle, gentlemanlike, gentlemanly, graceful,
   gracile, gracious, highbred, improved, ladylike, learned, lettered,
   literate, nice, pansophic, perfected, polished, polyhistoric,
   polymath, polymathic, profound, refined, reformed, scholarly,
   scholastic, sophisticated, studious, subtle, transfigured,
   transformed, urbane, well-bred, well-brought-up, wise