(biology) The scientific study of the state of Earth's biodiversity with the objective to protect it from becoming extinct.

(mathematics, logic) An extension of a logical theory such that every theorem expressible in the original theory is also derivable within the original theory.

A moderate stream of Liberal Judaism centered in North America that theoretically maintains Jewish tradition and law, but provides for a more flexible interpretation of it than Orthodox Judaism, in keeping with an evolving world and society.

(physics) a principle stating that energy may not be created or destroyed

plural of conservative model

plural of conservation law

plural of conservative extension

plural of conservative treatment

Inoffensive to rightists.

A manner of action and rhetoric that is inoffensive to rightists.