extreme

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Most remote in any direction; outermost or farthest.
• adjective Being in or attaining the greatest or highest degree; very intense.
• adjective Being far beyond the norm: synonym: excessive.
• adjective Of the greatest severity; drastic.
• adjective Characterized by severe, usually oxygen-poor environmental conditions.
• adjective Having an affinity for such conditions.
• adjective Very dangerous or difficult.
• adjective Participating or tending to participate in a very dangerous or difficult sport.
• adjective Archaic Final; last.
• noun The greatest or utmost degree or point.
• noun Either of the two things situated at opposite ends of a range.
• noun An extreme condition.
• noun An immoderate, drastic expedient.
• noun The first or last term of a ratio or a series.
• noun A maximum or minimum value of a function.
• noun Logic The major or minor term of a syllogism.
• idiom (in the extreme) To an extreme degree.

from The Century Dictionary.

• Extremely; excessively; exceedingly.
• Outermost; situated at the utmost limit, point, or border; furthest of all; largest or smallest or last: as, the extreme verge or edge of a roof or a precipice; the extreme limit or hour of life.
• Utmost or greatest in degree; the most, greatest, best, or worst that can exist or be supposed; such as cannot be exceeded: as, extreme pain or grief; extreme joy or pleasure; an extreme case.
• Exacting or severe to the utmost.
• In music, superfluous or augmented: thus, the extreme sharp sixth is the augmented sixth.
• Synonyms Uttermost, most distant, most remote, terminal.
• Final, ultimate, utter.
• noun The utmost point or verge of a thing; that part which terminates a body; an extremity; the end or one of the ends, especially of correlated parts, of a body.
• noun The utmost limit or degree that can be supposed or tolerated; either of two states, qualities, or feelings as different from each other as possible; the highest or the lowest degree: as, the extremes of heat and cold; avoid extremes.
• noun Extremity; utmost need or distress.
• noun In logic, the subject or the predicate of a categorical proposition; specifically, the subject or the predicate of the conclusion of a syllogism; either of two terms which are separated in the premises and brought together in the conclusion.
• noun In mathematics: Either of the first and last terms of a proportion, or of any other related sequence or series of terms: as, when three magnitudes are proportional, the rectangle contained by the extremes is equal to the square of the mean.
• noun The largest or the smallest of three or more magnitudes.
• noun Any part of a right-angled or quadrantal spherical triangle other than the part assumed as mean.
• noun Synonyms See extremity.

from the GNU version of the Collaborative International Dictionary of English.

• adjective At the utmost point, edge, or border; outermost; utmost; farthest; most remote; at the widest limit.
• adjective Last; final; conclusive; -- said of time.
• adjective The best of worst; most urgent; greatest; highest; immoderate; excessive; most violent
• adjective Radical; ultra.
• adjective (Mus.) Extended or contracted as much as possible; -- said of intervals
• adjective (Geom.) the relation of a line and its segments when the line is so divided that the whole is to the greater segment is to the less.
• adjective (Paint.) See Distance., n., 6.
• adjective See under Unction.
• noun The utmost point or verge; that part which terminates a body; extremity.
• noun Utmost limit or degree that is supposable or tolerable; hence, furthest degree; any undue departure from the mean; -- often in the plural: things at an extreme distance from each other, the most widely different states, etc.
• noun An extreme state or condition; hence, calamity, danger, distress, etc.
• noun (Logic) Either of the extreme terms of a syllogism, the middle term being interposed between them.
• noun (Math.) The first or the last term of a proportion or series.
• noun as much as possible.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of a place, the most remote, farthest or outermost.