<p><strong>Noun</strong></p><ul><li>a pause, as for breath.</li><li>vigorous exercise that causes heavy breathing.</li><li>breathe.</li><li>a person who breathes.</li><li>a vent in a container or covering, as in a casing for machinery or in a storage tank, to equalize interior and exterior pressure, permit entry of air, escape of fumes, or the like.</li><li>a device for providing air from the atmosphere to submerged or otherwise sealed-off persons, internal-combustion engines, etc.: the snorkel breather of a submarine.</li></ul>