1. moving or allowing movement in one direction only: "a one-way valve"
▪ (of a ticket) allowing a person to travel to a place but not back again; single.
▪ denoting a mirror or glass that acts as a reflective surface on one side but that is transparent from the other.
▪ denoting a relationship in which all the input comes from only one member:"interaction between the organism and the environment is not a one-way process"