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1919, from en- (1) "make, put in" + code. Computing sense is from 1955, usually shortened colloquially to code. Related: Encoded; encoding.
1. Any program, circuit or algorithm which encodes. Example usages: "MPEG encoder", "NTSC encoder", "RealAudio encoder". 2. A sensor or transducer for converting rotary motion or position to a series of electronic pulses. (1997-03-04)