The Collaborative International Dictionary of English v.0.48:

Osculate \Os"cu*late\, v. t. [imp. & p. p. Osculated; p. pr. &
   vb. n. Osculating.] [L. osculatus, p. p. of osculari to
   kiss, fr. osculum a little mouth, a kiss, dim. of os mouth.
   See Oral, and cf. Oscillate.]
   [1913 Webster]
   1. To kiss.
      [1913 Webster]

   2. (Geom.) To touch closely, so as to have a common curvature
      at the point of contact. See Osculation, 2.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Osculate \Os"cu*late\, v. i.
   1. To kiss one another; to kiss.
      [1913 Webster]

   2. (Geom.) To touch closely. See Osculation, 2.
      [1913 Webster]

   3. (Biol.) To have characters in common with two genera or
      families, so as to form a connecting link between them; to
      interosculate. See Osculant.
      [1913 Webster]

WordNet (r) 3.0 (2006):

osculate
    v 1: be intermediate between two taxonomic groups; "These
         species osculate"
    2: have at least three points in common with; "one curve
       osculates the other"; "these two surfaces osculate"
    3: touch with the lips or press the lips (against someone's
       mouth or other body part) as an expression of love, greeting,
       etc.; "The newly married couple kissed"; "She kissed her
       grandfather on the forehead when she entered the room" [syn:
       snog, kiss, buss, osculate]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "osculate":
   blow a kiss, brush, brush by, bus, buss, caress, come in contact,
   contact, glance, graze, hit, impinge, kiss, lip, nudge, peck, rub,
   scrape, shave, sideswipe, skim, skirt, smack, smooch, squeak by,
   touch