octane numbernoun [ C ]uk /ˈɒk.teɪn ˌnʌm.bər/ us /ˈɑːk.teɪn ˌnʌm.bɚ/ also octane rating
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(Definition of “octane number” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to (cause someone to) be in a position in which the lower part of the body is resting on a seat or other type of support, with the upper part of the body vertical