From The Collaborative International Dictionary of English v.0.48:

Osculation \Os`cu*la"tion\, n. [L. osculatio a kissing: cf. F.
   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]
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