from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. To be nervous or uneasy; fidget.
- intransitive v. To make small quick jumpy movements. The pictures on the wall jitter whenever a truck drives by.
- n. A jittering movement; a tic.
- n. A fit of nervousness. Often used with the.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A program or routine that performs jitting.
- n. A nervous action; a tic.
- n. A state of nervousness.
- n. An abrupt and unwanted variation of one or more signal characteristics.
- v. To be nervous.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a small irregular movement
- n. small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources
Perhaps alteration of chitter.(American Heritage® Dictionary of the English Language, Fourth Edition)
jit + -er (Wiktionary)
Possibly alteration of chitter ("tremble, shiver"), from Middle English chittern ("to twitter, chatter") (Wiktionary)