1) utilisation time 2) utilization time the quotient, expressed in hours, of the consumption within a specified period, e.g. year, month, day, etc., and the maximum or other specified demand a occurring within the same period GRM: n. (1,2) REG: British English (1), American English (2) USG: generally not to be used without specifying the demand and the period to which it relates (1,2) Note: