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WordBand 6.5–8Academic (NAWL)
oscillation
/ˌɒsɪˈleɪʃən/
noun
movement, from side to side at a steady speed; a frequent change in size, strength, or direction between two limits
Source: New Academic Word List (Browne, Culligan & Phillips) (CC BY-SA 4.0); IPA generated with eSpeak NG (GPL-3.0 (software))