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Definition: ISA

(1) (Instruction Set Architecture) See instruction set.

(2) (Industry Standard Architecture) An earlier bus system used in PCs. See ISA bus.

(3) (Interactive Services Association) See Internet Alliance.

(4) See internal security assessor.

(5) (International Society of Automation, RTP, NC, www.isa.org) A trade association founded in 1945 that is dedicated to industrial control systems which includes measurement and instrumentation, robotics, motion control and process control. ISA supports ISA EXPO, the industry's premier trade show for more than 50 years as well as the Directory of Instrumentation.