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The variation in the time it takes for packets of information to travel across a network. Jitter is caused by any deviation or displacement in the packet’s path, causing a delay in the packet delivery, or causing the packets to arrive in a different order. For a caller, jitter is experienced as choppy, poor quality audio.

Merriam-Webster Online Dictionary
jitter (noun)
a sense of panic or extreme nervousness - had a bad case of the jitters before his performance
the state of mind or the movement of one that - jitters
irregular random movement (as of a pointer or an image on a television screen) , also vibratory motion
jitter (verb)
intransitive verb
to be nervous or act in a nervous way
to make continuous fast repetitive movements
Jitter (Wikipedia)

In electronics and telecommunications, jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal. In clock recovery applications it is called timing jitter. Jitter is a significant, and usually undesired, factor in the design of almost all communications links.

Jitter can be quantified in the same terms as all time-varying signals, e.g., root mean square (RMS), or peak-to-peak displacement. Also like other time-varying signals, jitter can be expressed in terms of spectral density.

Jitter period is the interval between two times of maximum effect (or minimum effect) of a signal characteristic that varies regularly with time. Jitter frequency, the more commonly quoted figure, is its inverse. ITU-T G.810 classifies jitter frequencies below 10 Hz as wander and frequencies at or above 10 Hz as jitter.

Jitter may be caused by electromagnetic interference and crosstalk with carriers of other signals. Jitter can cause a display monitor to flicker, affect the performance of processors in personal computers, introduce clicks or other undesired effects in audio signals, and cause loss of transmitted data between network devices. The amount of tolerable jitter depends on the affected application.

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