plural of real number

(mathematics) The smallest set containing all limits of convergent sequences of rational numbers.

(philosophy) real being

(complex analysis) Of a complex number a + bi, the value a.

Life outside of a contrived or fantastical environment; often used in comparison to events depicted in drama. / (by extension, sometimes capitalized) Life outside the Internet.

(retronym) an indoor racket sport from which the modern game of tennis (lawn tennis) is descended

The realm of human experience comprising physical objects, and excluding theoretical constructs, hypotheses, artificial environments, and "virtual" worlds such as the Internet, computer simulations, or the imagination.

Communicated as the events being responded to occur; communicated or proceeding without much delay (compare instantaneous, synchronous)

(idiomatic) The genuine thing, neither a substitute nor an imitation.

(idiomatic, colloquial) To be authentic, true to oneself; to be cool. / (idiomatic, colloquial) In the imperative, an exhortation used as a departing salutation.