evergreen
adjective
°Of plants, especially trees, that do not shed their leaves seasonally.
°Continually fresh or self-renewing; often used metaphorically.
noun
°A tree or shrub that does not shed its leaves or needles seasonally.
°More specifically, a conifer tree.
verb
°To extend the term of a patent beyond the normal legal limit, usually through repeated small modifications.
°To set the repayment rate of a loan at or below the interest rate, so low that the principal will never be repaid.