ADJECTIVE (3)

1. morally pure (especially not having experienced sexual intercourse);
- Example: "a holy woman innocent and chaste"

2. pure and simple in design or style;
- Example: "a chaste border of conventionalized flowers"

3. abstaining from unlawful sexual intercourse;

The Collaborative International Dictionary of English v.0.48:

Chaste \Chaste\ (ch[=a]st), a. [F. chaste, from L. castus pure,
   chaste; cf. Gr. kaqaro`s pure, Skr. [,c]udh to purify.]
   [1913 Webster]
   1. Pure from unlawful sexual intercourse; virtuous;
      continent. "As chaste as Diana." --Shak.
      [1913 Webster]

            Whose bed is undefiled and chaste pronounced.
                                                  --Milton.
      [1913 Webster]

   2. Pure in thought and act; innocent; free from lewdness and
      obscenity, or indecency in act or speech; modest; as, a
      chaste mind; chaste eyes.
      [1913 Webster]

   3. Pure in design and expression; correct; free from
      barbarisms or vulgarisms; refined; simple; as, a chaste
      style in composition or art.
      [1913 Webster]

            That great model of chaste, lofty, and eloquence,
            the Book of Common Prayer.            --Macaulay.
      [1913 Webster]

   4. Unmarried. [Obs.] --Chaucer.

   Syn: Undefiled; pure; virtuous; continent; immaculate;
        spotless.
        [1913 Webster]

   Chaste tree. Same as Agnus castus.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chaste
    adj 1: morally pure (especially not having experienced sexual
           intercourse); "a holy woman innocent and chaste" [ant:
           unchaste]
    2: pure and simple in design or style; "a chaste border of
       conventionalized flowers"
    3: abstaining from unlawful sexual intercourse