plural of universal donor

(medicine) A person with blood type O, which lacks antigens and is therefore compatible with all other blood types, allowing them to donate blood to any other person.

(mathematics) The property of there being a unique morphism from an arbitrary object to the universal morphism of a comma category which is from a functor to a fixed object; or, dually, the property of there being a unique morphism from the universal morphism to an arbitrary object of a comma category which is from a fixed object to a functor. (Caveat: the uniqueness is up to isomorphism.)

A universal proposition in logic.

plural of abstract universal

(linguistics) A mechanism whereby countable nouns are made uncountable.

The part of the physical universe that is known by observation or inference.

(education) A university specialising in the study of engineering, science and technology.

plural of technological university

(astronomy) The extent of a universe within the cosmological horizon of an observer.