oscillate - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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oscillate

verb [I] uk   /ˈɒs.ɪ.leɪt/  us   /ˈɑː.səl.eɪt/
to move repeatedly from one position to another: The needle on the dial oscillated between full and empty. formal If you oscillate between feelings or opinions, you change repeatedly from one to the other: My emotions oscillate between desperation and hope. specialized physics (of a wave or electric current) to change regularly in strength or direction
oscillation
noun [C or U] uk   /ˌɒs.ɪˈleɪ.ʃən/  us   /ˌɑː.səlˈeɪ-/ formal or specialized
(Definition of oscillate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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