Unidirectionaladjective
Pertaining to only one direction, e.g.: where all component parts are aligned in the same direction in space.
Bidirectionaladjective
Moving in two directions (usually opposite)
Unidirectionalnoun
A fabric in which the majority of fibres run in the same single direction.
Bidirectionaladjective
Operating or functioning in two directions (usually opposite)
Unidirectionaladjective
operating or moving or allowing movement in one direction only;
‘a unidirectional flow’; ‘a unidirectional antenna’; ‘a unidirectional approach to a problem’;
Bidirectionalnoun
Such an antenna or microphone
Bidirectionaladjective
reactive or functioning or allowing movement in two usually opposite directions