evergreen

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Having foliage that persists and remains green throughout the year.
• adjective Perennially fresh or interesting; enduring.
• adjective Automatically renewed or repeatedly made valid.
• noun A tree, shrub, or plant having foliage that persists and remains green throughout the year.
• noun Twigs or branches of evergreen plants used as decoration.
• noun Something that remains perennially fresh, interesting, or well liked.

from The Century Dictionary.

• Always green; verdant throughout the year; sempervirid: as, the pine is an evergreen tree.
• noun A plant that retains its verdure through all the seasons, as the pine and other coniferous trees, the holly, laurel, holm-oak, ivy, rhododendron, and many others.
• noun A woolen material similar to cassimere: a term in use about 1850.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) An evergreen plant.
• noun Twigs and branches of evergreen plants used for decoration.
• adjective (Bot.) Remaining unwithered through the winter, or retaining unwithered leaves until the leaves of the next year are expanded, as pines cedars, hemlocks, and the like.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of plants, especially trees, that do not shed their leaves seasonally.
• adjective Continually fresh or self-renewing; often used metaphorically.
• adjective Of a document or dataset, continually up-to-date (as opposed to being published at regular intervals and being slightly outdated in-between those publication dates)
• adjective broadcasting Suitable for transmission at any time; not urgent or time-dependent.
• noun A tree or shrub that does not shed its leaves or needles seasonally.
• noun informal More specifically, a conifer tree.
• noun colloquial A news story that can be published or broadcast at any time.
• verb patents, pharmaceuticals To extend the term of a patent beyond the normal legal limit, usually through repeated small modifications.
• verb banking To set the repayment rate of a loan at or below the interest rate, so low that the principal will never be repaid.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective (of plants and shrubs) bearing foliage throughout the year
• noun a plant having foliage that persists and remains green throughout the year