noun
(countable) An evergreen tree of the genus Citrus such as Citrus sinensis which yields oranges (the fruit).
(countable) Any round citrus fruit with a yellow-red colour when ripe and a sour-sweet taste; the fruit of the orange tree.
(uncountable) The colour of a ripe fruit of an orange tree, midway between red and yellow.
(uncountable) Various drinks:
(heraldry) An orange-coloured roundel.
adjective
Having the colour of the fruit of an orange tree; yellowred; reddish-yellow.
verb
(transitive) To color orange.
(intransitive) To become orange.