Source:http://linkedlifedata.com/resource/umls/id/C0457385
NCI: A unit of time, one of the seven base units of the International System of Units (Systeme International d'Unites, SI). The second is the duration of 919 263 177 0 periods of the specified light radiation corresponding to the transition between the two hyperfine levels of the caesium 133 atom in its ground state at 0 K. According to the convention, 60 seconds constitute one minute; 3,600 seconds constitute one hour.,NCI: The second is a unit of time with a duration of 919 263 177 0 periods of the specified light radiation corresponding to the transition between the two hyperfine levels of the cesium 133 atom in its ground state at 0 K. According to the convention, 60 seconds constitute one minute; 3,600 seconds constitute one hour. Abbreviation Sec. is acceptable in non-scientific usage only.(NCI),CHV: unit of time,CHV: unit of time,CHV: unit of time,CHV: unit of time,CHV: unit of time,HL7V3.0: <p>1 '/60</p>,HL7V3.0: <p>1 Ohm-1</p>