Jitter definition in Computer Security terms:
Definition(s): As it relates to queuing, the difference in latency of packets.
Source(s): NIST SP 800-127
Non-uniform delays that can cause packets to arrive and be processed out of sequence.
Source(s): NIST SP 800-58
The time or phase difference between the data signal and the ideal clock.
Source(s): NIST SP 800-82 Rev. 2
reference: CSRC Glossary