The disposition of props, scenery, etc. for a play. / (figuratively, by extension) The context or environmental surroundings of an event; ambiance.

(mathematics) Synonym of singleton (“a set containing exactly one element”)

(film, television) A nondescript set that does not represent any particular place.

(mathematics, given some set and an equivalence relation on that set) the set consisting of all equivalence classes

(anthropology) An established social category or group consisting of people born during a certain time span who together move through a series of culturally defined age grades.

present participle of set down

The flask and cups used to serve sake.

Of something that sets itself or is set by oneself. / Of plants, especially from seed, that germinate and grow without being planted or sown, and without any person's involvement.

Alternative spelling of drop set

(bodybuilding) A set of repetitions of an exercise wherein muscular failure is reached and before resting the exercise is continued with decreased resistance to failure.