Definitions
1.NounAny of various devices for comparing a physical property of two objects, or an object with a standard."optical comparator"
2.NounAn electronic device that compares two voltages, currents or streams of data."electrical comparator"
3.NounAnything that serves as a comparison.
4.NounA thing being compared against in the PICO process; often, a diagnostic method or a treatment being compared against another.
5.NounAn application or program that compares prices, rates, tariffs of flights, smartphones, cars, etc.