overtempEtymologyClipping of overtemperature, or, by surface analysis, over- + temp.overtemp means A condition in which a device or machine has reached a temperature above that approved by the manufacturer. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA condition in which a device or machine has reached a temperature above that approved by the manufacturer.An exhaust temperature that exceeds the maximum allowable limit for a given operating condition or time limit.