winter (n.) Look up winter at Dictionary.com
Old English, "fourth season of the year," from Proto-Germanic *wentruz (cf. Old Frisian, Dutch winter, Old Saxon, Old High German wintar, German winter, Danish and Swedish vinter, Gothic wintrus, Old Norse vetr "winter"), possibly from PIE *wed-/*wod-/*ud- "wet" (see water), or from *wind- "white" (cf. Celtic vindo- "white").

The Anglo-Saxons counted years in "winters," cf. Old English ænetre "one-year-old." Old Norse Vetrardag, first day of winter, was the Saturday that fell between Oct. 10 and 16.
winter (v.) Look up winter at Dictionary.com
"to pass the winter (in some place)," late 14c., from winter (n.). Related: Wintered; wintering.