UK standard spelling of arbor.

(mathematics) Used to form the names of inverse trigonometric functions, and the symbols for these functions.

Any of the eight-legged creatures, including spiders, mites, and scorpions, of the class Arachnida.

(agriculture, of land) Able to be plowed or tilled, capable of growing crops (traditionally contrasted with pasturable lands such as heaths).

(basketball, informal) Outside the three-point line.

The act or process of arbitrating. / A process through which two or more parties use an arbitrator or arbiter in order to resolve a dispute.

To make a judgment (on a dispute) as an arbitrator or arbiter / To submit (a dispute) to such judgment / (mathematics, rare) To assign an arbitrary value to, or otherwise determine arbitrarily.

Any of the evergreen trees and shrubs known as arborvitae, of the genera Thuja and Thujopsis, or of the species Platycladus orientalis. / (anatomy) White matter of the cerebellum.

An international organization of Arabic-speaking countries.

A peninsula between the Red Sea and the Persian Gulf; includes Jordan, Saudi Arabia, Yemen, Oman, Qatar, Bahrain, Kuwait, and the United Arab Emirates.