(linguistics) A branch of historical linguistics that is concerned with comparing languages in order to establish their historical relatedness.

(anthropology, sociology, ethics) A type of descriptive ethics, focused on studying the nature and origins of beliefs about morality held by people in diverse social or cultural groups.

(grammar) A case used to mark a likeness to something, or that two things have the same quantity of something. It corresponds roughly to the English adverb "like". Languages that use the comparative case include Mari, Nivkh, and Chechen.

(grammar) In Spanish: the superlative form of an adjective when it is used in a grammatically comparative situation.

plural of comparative case

the study of similarities and differences in the anatomy of organisms

plural of comparative degree

linguist whose field is comparative linguistics.

(linguistics) A technique for studying the development of languages by performing a feature-by-feature comparison of two or more languages with a common ancestor.

(economics) The ability to produce a particular good at a lower relative opportunity cost than another producer.