(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.

A drum kit

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

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

(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.

plural of set point

(computer science, parsers) A set of production rules which have an identical sequence of symbols between the right arrow (→) and the dot (•). / (statistics) A group of related items.

Stitched according to a formal pattern.

(idiomatic) To set specific standards or expectations.

plural of set-up