Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: ComputersCBTCBT /ˌsiː biː ˈtiː/ noun [uncountable] 1 (computer-based testing) a way of taking standard tests such as the GRE on a computer2 (computer-based training) the use of computers to teach people to do something CBT software ldoceonline.com