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) n. - The tree that bears oranges; the orange tree.
3) n. - The color of an orange; reddish yellow.
4) a. - Of or pertaining to an orange; of the color of an orange; reddish yellow; as, an orange ribbon.