—adj. 1. of a character or kind farthest removed from the ordinary or average: extreme measures. 2. utmost or exceedingly great in degree: extreme joy. 3. farthest from the center or middle; outermost; endmost: the extreme limits of a town. 4. farthest, utmost, or very far in any direction: an object at the extreme point of vision. 5. exceeding the bounds of moderation: extreme fashions. 6. going to the utmost or very great lengths in action, habit, opinion, etc.: an extreme conservative. 7. last or final: extreme hopes. 8. Chiefly Sports.extremely dangerous or difficult: extreme skiing.
—n. 1. the utmost or highest degree, or a very high degree: cautious to an extreme. 2. one of two things as remote or different from each other as possible: the extremes of joy and grief. 3. the furthest or utmost length; an excessive length, beyond the ordinary or average: extremes in dress. 4. an extreme act, measure, condition, etc.: the extreme of poverty. 5. Math. a. the first or the last term, as of a proportion or series.
b. a relative maximum or relative minimum value of a function in a given region.
6. Logic.the subject or the predicate of the conclusion of a syllogism; either of two terms that are separated in the premises and brought together in the conclusion.
7. Archaic.the utmost point, or extremity, of something.