Real Dictionary

ivy
variable noun: Ivy is an evergreen plant that grows up walls or along the ground.

Ivy in American English
a climbing vine (Hedera helix) of the ginseng family, with a woody stem and evergreen leaves, grown as ornamentation on buildings, walls, etc.
a feminine name
of or characteristic of the Ivy League
adjective
noun: a climbing vine, Hedera helix, having smooth, shiny, evergreen leaves, small, yellowish flowers, and black berries, grown as an ornamental
noun: a female given name

ivy in British English
noun: any woody climbing or trailing araliaceous plant of the Old World genus Hedera, esp H. helix, having lobed evergreen leaves and black berry-like fruits