Webster's English Dictionary

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groove

groove \'gru:v\ n [ME groof; akin to OE grafan to dig - more at GRAVE] 1: a 
   long narrow channel or depression  2a: a fixed routine : RUT  2b: a 
   situation suited to one's abilities or interests : NICHE  3: top form {a 
   great talker when he is in the ~}  - groove vt