EMIS'SION, n. [L. emissio, from emitto, to send out.] The act of sending or throwing out; as the emission of light from the sun or other luminous body; the emission of odors from plants; the emission of heat from a fire.1. The act of sending abroad or into circulation notes of a state or of a private corporation; as the emission of state notes, or bills of credit, or treasury notes.2. That which is sent out or issued at one time; an impression or a number of notes issued by one act of government. We say, notes or bills of various emissions were in circulation.