Definition of: breathing

(brē′thing) adjective
Respiring; living. See synonyms under ALIVE.
—noun
1. The act of respiration; a breath.
2. Time to take breath.
3. Exercise that quickens the breath.
4. Gram. An aspiration; aspirate. In Greek the rough breathing (') over an initial vowel indicates the sound equivalent to our letter h; the smooth breathing ('), its absence.