B2[U]Someone's reach is the distance within which they can stretch out their arm and touch something: I like to keep a notebook and pencil within (arm's) reach.The top shelf is within/out of (his) reach.Make sure that you keep all dangerous substances out of the reach of the children.Measurements of length and distanceB2[U]the distance that can be travelled, especially easily: We live within(easy) reach of the station.Measurements of length and distance›[S]the length of your arm when you stretch it out: You've got quite a long reach - can you get that box down from the top shelf for me?Measurements of length and distance›[Cusually singular]an act of stretching out your arm: He made a sudden reach for his gun.Stretching the body