(set theory, measure theory, probability theory) A non-empty collection of subsets of a given set Ώ that is closed under non-empty finite intersections.

Alternative form of systemwide

A person whose job it is to maintain computer or network systems.

A system of plant taxonomy published by Charles Bessey in 1915.

(film) A method of filmmaking wherein the production and distribution of films is dominated by a small number of large movie studios (the majors).

plural of imperial system

plural of Steiner system

(mathematics) In combinatorial mathematics, a type of block design, specifically a t-design with λ = 1 and t = 2 or (recently) t ≥ 2.

plural of airport system

(aviation) A collection of airports, heliports or other aviation facilities that serve a particular location.