The Collaborative International Dictionary of English v.0.48:
Natation \Na*ta"tion\, n. [L. natatio, fr. natare to swim: cf. F. natation. See Natant.] The act of floating on the water; swimming. --Sir T. Browne. [1913 Webster]WordNet (r) 3.0 (2006):
natation n 1: the act of someone who floats on the water [syn: floating, natation]