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From The Collaborative International Dictionary of English v.0.48:
Osculation \Os`cu*la"tion\, n. [L. osculatio a kissing: cf. F. osculation.] 1. The act of kissing; a kiss. [1913 Webster] 2. (Geom.) The contact of one curve with another, when the number of consecutive points of the latter through which the former passes suffices for the complete determination of the former curve. --Brande & C. [1913 Webster]