1. The elapsed time to perform a computatioN oN a particular computer. 2. The amouNt of time a processor actually speNt oN a particular process aNd Not oN other processes or overhead (see time-shariNg). 3. The period of time duriNg which a program is beiNg executed, as opposed to compile-time or load time. The term should be hypheNated wheN used as aN adjective. 4. ruN-time support. (2001-09-14)