Source : Webster's Revised Unabridged Dictionary (1913)

Yogi \Yo"gi\, n. [Skr. y[=o]gin.]
   A follower of the yoga philosophy; an ascetic. [Spelt also
   {yokin}.] --Whitworth.

Source : WordNet®

Yogi
     n 1: United States baseball player (born 1925) [syn: {Berra}, {Lawrence
          Peter Berra}, {Yogi Berra}]
     2: one who practices yoga and has achieved a high level of
        spiritual insight