one-way /wʌn.weɪ/adjective 3noun 1verb 1forms 3 adjective3 •Allowing movement, vision, etc. in only one direction; unidirectional.The town centre is now a system of one-way streets. •Allowing travel in only one direction.I bought a one-way ticket to Leeds. •Of a function: easy to compute for every input, but hard to invert given the image of a random input. noun1 •A one-way trip or flight.I wanted to fly but they say a system's coming in Chances are high that this is a one way — 2025 verb1 •To use a disc harrow to turn the soil and kill weeds, in preparation for planting seeds. formsone-wayed · one-waying · one-ways