"One-way" refers to a direction or path that allows movement in only one direction. This term is commonly used in traffic signs, indicating that vehicles can only travel in the specified direction. For example, a one-way street sign informs drivers that they must not enter from the opposite direction. In other contexts, "one-way" can describe communication methods where information flows in a single direction. For instance, a one-way radio transmits messages without allowing the receiver to respond. This concept is also relevant in one-way relationships, where one party invests more effort or emotion than the other.