(1):

(n.) The fruit of a tree of the genus Citrus (C. Aurantium). It is usually round, and consists of pulpy carpels, commonly ten in number, inclosed in a leathery rind, which is easily separable, and is reddish yellow when ripe.

(2):

(a.) Of or pertaining to an orange; of the color of an orange; reddish yellow; as, an orange ribbon.

(3):

(n.) The color of an orange; reddish yellow.

(4):

(n.) The tree that bears oranges; the orange tree.