noun 1. a system of measuring time based on atomic clocks that measure the second as the basic unit of time in the (SI). Abbreviation: IAT. noun 1. the scientific standard of time based on the SI unit, the second, used by means of atomic clocks and satellites to synchronize the time standards of the […]
- International brigade
noun 1. a military force that fought on the Republican side in the Spanish Civil War, consisting of volunteers (predominantly socialists and communists) from many countries
- Intermittent tetanus
intermittent tetanus n. See tetany.
- Intermittent mandatory ventilation
intermittent mandatory ventilation n. Abbr. IMV Mechanical application of positive pressure at a determined frequency to the airway so as to increase tidal volume.