(mathematics) A set which contains any convex combination of any (finite) subset of its points.

A drum kit

Set deeply below a surface, as on a face. / (figuratively) firmly in place; long-standing

Third-person singular simple present indicative form of set fire

Third-person singular simple present indicative form of set on fire

Third-person singular simple present indicative form of set apart

(US, idiomatic, countrified dialect) To sit down for a period of time, especially in the company of other people and in order to relax or to engage in casual conversation.

(mathematics) In complex dynamics, a set consisting of values generated by a mathematical function such that an arbitrarily small perturbation can cause drastic changes in the sequence of iterated function values.

plural of Julia set

(topology) A set of points of a topological space such that each point in the set is an isolated point, i.e. a point that has a neighborhood that contains no other points of the set.