Webster's English Dictionary

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twitter

1. twit.ter \'twit-*r\ \-*r-*r\ vb [ME twiteren; akin to OHG zwizziro-n to 
   twitter] 1: to utter successive chirping noises  2a: to talk in a 
   chattering fashion  2b: GIGGLE, TITTER  3: to tremble with agitation : 
   FLUTTER  1: to chirp out  2: to shake rapidly back and forth : FLUTTER  - 
   twit.ter.er n
2. twitter \'twit-*-re-\ n 1: a trembling agitation : QUIVER  2: the 
   chirping of birds  3a: a light chattering : GABBLE  3b: a light silly laugh 
   : GIGGLE  - twit.tery aj