simple; consisting of or characterized by a single element.
pertaining to or noting a telecommunications system permitting communication in only one direction at a time.
Mathematics. a basic geometric element in a Euclidean space, being a line segment in one dimension, a triangle in two dimensions, a tetrahedron in three dimensions, and so on: used in topology and linear programming.
an apartment having all the rooms on one floor.
permitting the transmission of signals in only one direction in a radio circuit, etc Compare duplex