of a character or kind farthest removed from the ordinary or average

extreme measures.

utmost or exceedingly great in degree

extreme joy.

farthest from the center or middle; outermost; endmost

the extreme limits of a town.

farthest, utmost, or very far in any direction

an object at the extreme point of vision.

exceeding the bounds of moderation

extreme fashions.

going to the utmost or very great lengths in action, habit, opinion, etc.

an extreme conservative.

last or final

extreme hopes.

Chiefly Sports . extremely dangerous or difficult

extreme skiing.

the utmost or highest degree, or a very high degree

cautious to an extreme.

one of two things as remote or different from each other as possible

the extremes of joy and grief.

the furthest or utmost length; an excessive length, beyond the ordinary or average

extremes in dress.

an extreme act, measure, condition, etc.

the extreme of poverty.

Mathematics .

the first or the last term, as of a proportion or series.

a relative maximum or relative minimum value of a function in a given region.

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.

Archaic . the utmost point, or extremity, of something.