Respiration/ˌrespəˈreɪʃn/ Definition 1 of 3Pro Tip 1/3Physical Action Used to describe the physical movement involved in breathing. He focused on his respiration while meditating. Pro Tip 2/3Health Indicator Refers to breathing as a vital sign checked by medical professionals. The paramedics monitored her respiration closely. Pro Tip 3/3Common Expression Often used in everyday language to discuss breathing normally or when ill. His cold is bad, but his respiration is unaffected.