Webster's English Dictionary

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chat

1. chat \'chat\ vi or chat.ted;  or chat.ting [ME chatten, short for 
   chatteren] 1: CHATTER, PRATTLE  2: to talk in a light, informal, or 
   familiar manner 
2. chat n [imit.] archaic  1: idle small talk : CHATTER  2: light familiar 
   talk; esp : CONVERSATION  3: any of several songbirds (as of the genera 
   Saxicola or Icteria)X)