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