A shady sitting place or pergola usually in a park or garden, surrounded by climbing shrubs, vines or other vegetation. / A grove of trees.

An axis or shaft supporting a rotating part on a lathe. / A bar for supporting cutting tools. / A spindle of a wheel.

A crossbow. / A crossbowman.

Of, relating to, or resembling a tree. / Living in or among trees. / Covered or filled with trees.

Any tree-dwelling creature.

A person appointed, or chosen, by parties to determine a controversy between them; an arbitrator.

(transitive) To act as arbiter.

UK standard spelling of arbor.

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.