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<communications> (hdx, from telegraphy) 1. A type of communication channel using a single circuit which can carry data in either direction but not both directions at once.
Compare: simplex, full-duplex.
2. An obsolete term for local echo.
(2001-07-21)
Nearby terms: HAKMEM « hakspek « HAL « half-duplex » halftone » HALGOL » HALMAT
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