Twitter

1. n. One who twits, or reproaches; an upbraider.
2. v. i. To make a succession of small, tremulous, intermitted noises.
3. v. i. To make the sound of a half-suppressed laugh; to titter; to giggle.
4. v. i. To have a slight trembling of the nerves; to be excited or agitated.
5. v. t. To utter with a twitter.
6. n. The act of twittering; a small, tremulous, intermitted noise, as that made by a swallow.
7. n. A half-suppressed laugh; a fit of laughter partially restrained; a titter; a giggle.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.