one-way

(wun)

adjective

  1. moving, or providing for movement, in one direction only: a one-way street, a one-way ticket
  2. without any reciprocal action or obligation: a one-way contract

See one-way in American Heritage Dictionary 4

adjective
  1. Moving or permitting movement in one direction only: a one-way street.
  2. Providing for travel in one direction only: a one-way ticket.

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