Definitions:
considered in relation or in proportion to something else

denoting a pronoun, determiner, or adverb that refers to an expressed or implied antecedent and attaches a subordinate clause to it, e.g. which, who.

(of major and minor keys) having the same key signature.

(of a service rank) corresponding in grade to another in a different service.

a person connected by blood or marriage

a relative pronoun, determiner, or adverb.

a term or concept which is dependent on something else.