Source : Webster's Revised Unabridged Dictionary (1913)

Sierra \Si*er"ra\, n. [Sp., properly, a saw, fr. L. serra a saw.
   See {Serrate}.]
   A ridge of mountain and craggy rocks, with a serrated or
   irregular outline; as, the Sierra Nevada.

         The wild sierra overhead.                --Whitter.

Source : WordNet®

sierra
     n 1: a range of mountains (usually with jagged peaks and
          irregular outline)
     2: a Spanish mackerel of western North America [syn: {Scomberomorus
        sierra}]

Source : Free On-Line Dictionary of Computing

Sierra
     
         (Or "Sierra On-Line") A computer game
        developer founded in the early 1980s by Ken and Roberta
        Willams in the small mountain town of Oakhurst California.
        Sierra was named after the local mountian range, 15 miles from
        the famous Yosemite National Park.
     
        In 1997 Sierra was purchased by {CUC} and its main office is
        now in Seattle, WA, USA.
     
        Products include Kings Quest, Space Quest, Police Quest, Quest
        for Glory, Robin Hood, Phantasmagoria, Leisure Suit Larry, Eco
        Quest and many more.
     
        {Home (http://www.sierra.com /)}.
     
        (1997-11-23)