etalonaine omadus, mida näitab antud materjali kindla suuruse jaoks kahe kindla mõõteprotseduuriga saadud mõõtetulemuste vahelise seose ning teiste kindlate materjalide mõõtetulemuste hulgas saadud seose lähedusaste, property of a reference material, demonstrated by the closeness of agreement between the relation among the measurement results for a stated quantity in this material, obtained according to two given measurement procedures, and the relation obtained among the measurement results for other specified materials