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From 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]