jit•terˈdʒɪt ər(n.)

1. the act or the condition of a person or thing that jitters.

2. jitters, a feeling of fright or uneasiness (usu. prec. by the):

   to get the jitters in an empty house.

3. fluctuating movement, as in an image on a television screen.

   Category: Radio and Television

4. (v.i.)to make a series of quick, shivering or jumping movements.

5. to behave nervously.

Origin of jitter:

1920–25