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tree. 1  a plant having a permanently woody main stem or trunk, ordinarily growing to a considerable height, and usually developing branches at some distance from the ground. 2  any of various shrubs, bushes, and plants, as the banana, resembling a tree in form and size. 3  something resembling a tree in shape, as a clothes tree or a crosstree.
n. 1. One that signifies. 2. Linguistics A linguistic unit or pattern, such as a succession of speech sounds, written symbols, or gestures, that conveys meaning; a linguistic sign. The signifier of the concept tree is, in English, the string of speech sounds (t), (r), and (Ä); in German, (b), (ou), and (m).