1. Suppressing or eliminating engine knock in combustion engines
   - antiknock

See also: leaded

• expansionism
• expansionist
• expansive
• expansive bit
• expansively
• expansiveness
• expansivity
• expat
• expatiate
• expatiation
• expatriate
• expatriation
• expect
• expectable
• expectancy
• expectant
• expectantly
• expectation
• expected
• expected value
• expectedly
• expectedness
• expectorant
• expectorate
• expectoration