A Ticket Only Valid for an Outbound Trip

This page is the CodyCross answer for the clue below from Architectural Styles, Group 1166, Puzzle 5 (Domes and Cupolas).

Question is: A Ticket Only Valid for an Outbound Trip

and the answer is: ONEWAY

Word Meaning:

ONE WAY — Alternative form of one-way.

Definitions from Wiktionary.