The Collaborative International Dictionary of English v.0.48:

Felicitation \Fe*lic`i*ta"tion\, n. [Cf. F. f['e]licitation.]
   The act of felicitating; a wishing of joy or happiness;
   congratulation.
   [1913 Webster]

WordNet (r) 3.0 (2006):

felicitation
    n 1: (usually plural) an expression of pleasure at the success
         or good fortune of another; "I sent them my sincere
         congratulations on their marriage" [syn: congratulation,
         felicitation]
    2: the act of acknowledging that someone has an occasion for
       celebration [syn: congratulation, felicitation]