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.

• 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.
• noun (Bot.) An evergreen plant.
• noun Twigs and branches of evergreen plants used for decoration.

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Of a document or dataset, continually up-to-date (as opposed to being published at regular intervals and being slightly outdated in-between those publication dates)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