The Collaborative International Dictionary of English v.0.48:

Calender \Cal"en*der\, v. i. [imp. & p. p. Calendered; p. pr.
   & vb. n. Calendering.] [Cf. F. calandrer. See Calender,
   n.]
   To press between rollers for the purpose of making smooth and
   glossy, or wavy, as woolen and silk stuffs, linens, paper,
   etc. --Ure.
   [1913 Webster]