A small model railroad with trains that move around the tracks by electricity (formerly by clockwork) / Alternative form of trainset.

plural of set screw

(mathematics, physics) A set of spacetimes that have a causality relationship

(transitive, idiomatic) To make (a person or persons) argue; to set quarrelling.

(mathematical analysis, topology) A subset of an interval formed by recursively removing an interval in the middle of every connected component of the set.

To prepare for something by providing a background, a description, etc.

(now historical) A dog trained to set game; a setter.

The finishing or last coat of plastering on walls or ceilings.

(idiomatic) To see; to observe.

(cooking) To leaven a small mass of flour, to be used in leavening a larger quantity.