one-way (oh)

adj [usually before noun]
a one-way street is one in which vehicles are only allowed to travel in one direction
::the town's one-way system
especially AmE a one-way ticket is for travelling from one place to another but not back again
-opposite round-trip round-trip
British Equivalent: single
a one-way process, relationship etc is one in which only one person makes any effort or provides anything