Jitter is basically a form of distortion...
TIMING JITTER is the variation in time of the significant instants (such as, zero crossings) of a digital signal, relative to a clock with no jitter above some low frequency (about 10 Hz).
RELATIVE JITTER / ALIGNMENT JITTER is the variation in time of the significant instants (such as, zero crossings) of a digital signal, relative to a clock recovered from the signal itself. (This clock will have jitter components above 10 Hz but none above a higher frequency in the 1 kHz to 10 kHz range.)
TIMING JITTER is the variation in time of the significant instants (such as, zero crossings) of a digital signal, relative to a clock with no jitter above some low frequency (about 10 Hz).
RELATIVE JITTER / ALIGNMENT JITTER is the variation in time of the significant instants (such as, zero crossings) of a digital signal, relative to a clock recovered from the signal itself. (This clock will have jitter components above 10 Hz but none above a higher frequency in the 1 kHz to 10 kHz range.)