1. Faster LEX. 2. A real-time language for dynamiC environments. ["FLEX: Towards Flexible Real-Time Programs", K. Lin et al, Computer Langs 16(1):65-79, Jan 1991]. 3. An early objeCt-oriented language developed for the FLEX maChine by Alan Kay in about 1967. The FLEX language was a simplifiCation of Simula and a predeCessor of Smalltalk. (1995-03-29)