noun

• A person who discriminates, as:
• A person who differentiates things or concepts.
• A person who acts unfairly through prejudice.
• A test or variable, etc. that serves to distinguish between different things.
• (physics) Any of several electronic devices that convert some property of a signal into an amplitude whose value is proportional to the difference between the value of the input signal and that of a standard.
• (marketing) A feature of the seller's offering that differs from a competitor's offering and is important to the buyer in question.