The Collaborative International Dictionary of English v.0.48:

Cincture \Cinc"ture\, n. [L. cinctura, fr. cingere, cinctum, to
   gird.]
   1. A belt, a girdle, or something worn round the body, -- as
      by an ecclesiastic for confining the alb.
      [1913 Webster]

   2. That which encompasses or incloses; an inclosure. "Within
      the cincture of one wall." --Bacon.
      [1913 Webster]

   3. (Arch.) The fillet, listel, or band next to the apophyge
      at the extremity of the shaft of a column.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cincture
    n 1: a band of material around the waist that strengthens a
         skirt or trousers [syn: girdle, cincture, sash,
         waistband, waistcloth]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "cincture":
   anklet, arena, armlet, band, begird, belt, bracelet, cingulum,
   circling, circumambience, circumambiency, circumcincture,
   circumflexion, circumjacence, circumposition, close, collar,
   collarband, confine, container, containment, coop, court,
   courtyard, curtilage, delimited field, earring, ecliptic,
   embracement, encincture, encirclement, enclave, enclosure,
   encompassment, enfoldment, engird, envelopment, environment,
   equator, fascia, field, fillet, finger ring, fold, gird, girding,
   girdle, girdling, girt, girth, great circle, ground, hoop,
   inclusion, involvement, list, neckband, necklace, nose ring, pale,
   paling, park, pen, quad, quadrangle, quoit, ring, sash, square,
   surrounding, theater, toft, waistband, wristband, wristlet, yard,
   zodiac, zone