A book of the Catholic and Eastern Orthodox canon of the Old Testament, considered apocryphal by Protestants.

(biblical) The ninth book of the Old Testament of the Bible, and of the Tanakh.

(biblical) The thirteenth book of the New Testament of the Bible, the first epistle to the Thessalonians.

(topology, of a topological space) Having a singleton as its fundamental group.

(astronomy, physics) The first generally accepted and confirmed black hole. A black hole in a high-mass X-ray binary (HMXB) with a blue supergiant companion (HD 226868), located in the constellation Cygnus.

(in sport) the achievement by a country of taking the first three positions in a race of competition.

(slang) A nickname for Detroit.

(transport) A three-lane road with two lanes in one direction and one lane in the other.

plural of 2+1 road

The 26 counties of the Republic of Ireland and the 6 counties of Northern Ireland together make a single United Ireland.