comparator

1. (law) Anything that serves comparison.Examples: "The applicant is therefore complaining not of a lack of action but rather of the decision of the local authority to reduce the care package that it had hitherto been making available to her. As such, a more appropriate comparator would be the case of Watts v. The United Kingdom (dec.), no. 53586/09 of 4 May 2010, in which the Court was content to proceed on the basis that a decision to close the care home where the elderly applicant was resident and to transfer her to another home constituted an interference with her rights under Article 8."; "Roxanne Khazarian (“Plaintiff”) moved to compel discovery from Gerald Metals, LLC and Metals Trading Corp (“Defendants”), seeking the personnel file of Gary Lerner, an employee of Defendants. […] Defendants object to the production of these documents on the grounds that Mr. Lerner is not an appropriate comparator for Ms. Khazarian and his personnel file is therefore irrelevant."

2. (computing) An application or program that compares prices, rates, tariffs of flights, smartphones, cars, etc.