unidirectional

Etymology

From uni- + directional.

adj

1. Pertaining to only one direction, e.g.: where all component parts are aligned in the same direction in space.
   … a reversible booster was fitted to the trailing bogie; all previous applications on the L.N.E.R. for use in main line traffic had been of unidirectional boosters, …. 1941 November, O. S. Nock, “The Locomotives of Sir Nigel Gresley: Part VI—Experiments and Rebuilds 1927-33”, in Railway Magazine, page 483
   Equally important is the class mailing list, which facilitates two-way communication at a distance. (By contrast, the web page is basically a unidirectional teacher-to-student communication.) 2005, Richard Samson, edited by Martha Tennent, Training for the New Millennium: Pedagogies for translation and interpreting, Benjamins Translation Library, page 119
2. Not subject to change or reversal of direction.

noun

1. A fabric in which the majority of fibers run in the same single direction.