To travel in a single direction; specifically used for one-way traffic or one-way streets.

To issue or execute rules and regulations separately for a specific matter or region.

To be printed or published as a separate volume or edition.

To occur individually or to travel alone; often used in the idiom 祸不单行 huò​bù​dān​xíng to describe misfortunes that do not come one at a time.

(bound form) A single column or a single row of text; printed in a single-spaced format.

A single row of people or things arranged one behind the other.