'Twitter' definitions:

Definition of 'twitter'

noun

A series of chirps [syn: chirrup, twitter]

verb

Make high-pitched sounds, as of birds [syn: chitter, twitter]

From: GCIDE

Twitter \Twit"ter\, n.
1. The act of twittering; a small, tremulous, intermitted noise, as that made by a swallow. [1913 Webster]
2. A half-suppressed laugh; a fit of laughter partially restrained; a titter; a giggle. --Hudibras. [1913 Webster]
3. A slight trembling or agitation of the nerves. [1913 Webster]

From: GCIDE

Twitter \Twit"ter\, n. [From Twit.] One who twits, or reproaches; an upbraider. [1913 Webster]

From: GCIDE

Twitter \Twit"ter\, v. i. [imp. & p. p. Twittered; p. pr. & vb. n. Twittering.] [OE. twiteren; of imitative origin; cf. G. zwitschern, OHG. zwizzir[=o]n, D. kwetteren, Sw. qvittra, Dan. quiddre. Cf. Titter.]
1. To make a succession of small, tremulous, intermitted noises. [1913 Webster]
The swallow twittering from the straw-built shed. --Gray. [1913 Webster]
2. To make the sound of a half-suppressed laugh; to titter; to giggle. --J. Fletcher. [1913 Webster]
3. [Perhaps influenced by twitch.] To have a slight trembling of the nerves; to be excited or agitated. [1913 Webster]

From: GCIDE