Longman Dictionary of Contemporary English homepage

oscillation

 noun
     
os‧cil‧la‧tion [uncountable and countable]
1 formalT oscillations are frequent changes between two extreme amounts or limits
oscillation in/of
oscillations in the value of the dollar
oscillation between
oscillating between growth and decline
2 formalT oscillations are frequent changes between one feeling or attitude and another:
The drug causes oscillations of mood in some people.
3 technical a regular movement of something from side to side:
the oscillations of a pendulum
4 technical a regular change in direction of an electrical current
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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