plural of REL

plural of relativity

(mathematics, of two or more numbers) having no factors (except the number 1) in common.

(grammar) A pronoun that introduces a relative clause and refers to an antecedent. Some words that can be used as interrogative pronouns can alternatively be used as relative pronouns: what, which, who, and whom. The other relative pronouns are whoever, whomever, whatever, and that.

(set theory, of set A "in" set B) The set containing exactly those elements belonging to B but not to A.

A person who is related to another through a common ancestor, and not merely by marriage or adoption.

plural of blood relative

(uncountable) A method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock. / (countable) An act of so doing.

(grammar) A relative pronoun used in an adjectival clause.

(physics) The theories of special relativity and general relativity, two theories in physics developed mainly by Albert Einstein at the beginning of the 20th century from which several important results such as the equivalence of matter and energy and the Einstein field equations are derived.