The Collaborative International Dictionary of English v.0.48:

Chastity \Chas"ti*ty\, n. [F. chastet['e], fr. L. castitas, fr.
   castus. See Chaste.]
   1. The state of being chaste; purity of body; freedom from
      unlawful sexual intercourse.
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            She . . . hath preserved her spotless chastity. --T.
                                                  Carew.
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   2. Moral purity.
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            So dear to heaven is saintly chastity,
            That, when a soul is found sicerely so
            A thousand liveried angels lackey her. --Milton.
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   3. The unmarried life; celibacy. [Obs.] --Chaucer.
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   4. (Literature & Art) Chasteness.
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WordNet (r) 3.0 (2006):

chastity
    n 1: abstaining from sexual relations (as because of religious
         vows) [syn: chastity, celibacy, sexual abstention]
    2: morality with respect to sexual relations [syn: virtue,
       chastity, sexual morality]