In circulation is a term used to describe something that is available for use or is actively being used. The term can be broken down into three parts: AFLOAT (6 letters), OUT (3 letters), and PUBLIC (6 letters). AFLOAT means floating on the surface of a body of water, while OUT means away from a particular place or position. PUBLIC refers to something that is open to all members of the PUBLIC. Together, these words indicate that something is available to the PUBLIC and is actively being used.