one-way

[ wuhn-wey ]

/ ˈwʌnˈweɪ /

moving, or allowing movement in one direction only: a one-way street.

valid for travel in one direction only: a one-way ticket. Compare round trip.

without a reciprocal feeling, responsibility, relationship, etc.: It's a one-way friendship.

not intended for return to a seller, dealer, etc., for reuse; disposable: one-way bottles.

Origin of one-way

First recorded in 1815–25

Lawmaking by legislatures is also a one-way ratchet—Legislators get credit for passing laws, not pruning them.

Red Tape Is Strangling Good Samaritans |Philip K. Howard |December 27, 2014 |DAILY BEAST
So I went straight to the airport, bought a one-way ticket, and flew out.

Laura Poitras on Snowden's Unrevealed Secrets |Marlow Stern |December 1, 2014 |DAILY BEAST
And yet he is too smart to despair that this is a one-way street.

Rackstraw Downes’s Art and Essays Are Two Sides of the Same Genius |Bill Morris |June 4, 2014 |DAILY BEAST
When he went to my dad with the news, the joy was a one-way street.

Binge Watching is Lame and Lonely |Roland S. Martin |February 19, 2014 |DAILY BEAST

Just give patients a sack lunch and a one-way bus ticket out of town.

Nevada Sued for ‘Greyhound Therapy’ for Mentally Ill Patients |John L. Smith |September 23, 2013 |DAILY BEAST
There wasn't anything complicated there, you could read "One-way ticket," couldn't you?

Warren Commission (5 of 26): Hearings Vol. V (of 15) |The President's Commission on the Assassination of President Kennedy
This concept produces a one-way verbal flow for which the term “monologue” is descriptive.

Herein is Love |Reuel L. Howe
Into a one-way skyway he rocketed, along it over the suburbs and into the transcontinental super-highway.

The Vortex Blaster |Edward Elmer Smith
The love of a pure, good woman and the one-way pocket—that's what makes the millionaires.

Young People's Pride |Stephen Vincent Benet
Yes, he told me that a round-trip ticket was cheaper than two one-way tickets.

Warren Commission (1 of 26): Hearings Vol. I (of 15) |The President's Commission on the Assassination of President Kennedy

one-way

moving or allowing travel in one direction only one-way traffic

entailing no reciprocal obligation, action, etc a one-way agreement