frequency drift

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Definitions:

An undesired progressive change in frequency with time. Frequency drift can be caused by instability in the oscillator and environmental changes, although it is often hard to distinguish between drift and oscillator aging. Frequency drift may be in either direction (resulting in a higher or lower frequency) and is not necessarily linear.
Sources:
NIST IR 8323r1 from NIST T&F Glossary

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