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See more synonyms for high-octane on Thesaurus.com
  1. noting a gasoline with a relatively high octane number, characterized by high efficiency and freedom from knock.
  2. Informal. forceful or intense; dynamic; high-powered: high-octane efforts to obliterate the competition.
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Origin of high-octane

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for high-octane


  1. (of petrol) having a high octane number
  2. informal dynamic, forceful, or intensehigh-octane drive and efficiency
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012