1) One way 2) Simplex 3) Unifacial 1) One-way 2) Simplex 3) Unifacial 
pertaining to a link where the transfer of users' information is possible in one preassigned direction only NOTE - This term should not be used to describe the direction of call set-ups.pertaining to a link where the transfer of user's information is possible in one preassigned direction only NOTE - This term should not be used to describe the direction of call set-up.
A pick-up pattern which is more sensitive to sound arriving from one direction than from any other.
[adj] - operating or moving or allowing movement in one direction only
adjective operating or moving or allowing movement in one direction only; `a unidirectional flow`; `a unidirectional antenna`; `a unidirectional approach to a problem`
A type of microphone which will only pick up sounds from one direction, usually directly in front. Loosely used as a synonym for cardioid (qv).
operating or moving in one direction only; not changing direction: a unidirectional flow.