adjective, extremer, extremest.
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.
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.

1425–75; late Middle English < Latin extrēmus, superlative of exterus outward. See exterior

extremeness, noun
overextreme, adjective
quasi-extreme, adjective
superextreme, adjective
superextremely, adverb
superextremeness, noun
unextreme, adjective

2. greatest, highest; superlative. 3. ultimate, last, uttermost, remotest. 6. extravagant, immoderate, excessive, fanatical, uncompromising, unreasonable. See radical.

6. moderate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extreme (ɪkˈstriːm)
1.  being of a high or of the highest degree or intensity: extreme cold; extreme difficulty
2.  exceeding what is usual or reasonable; immoderate: extreme behaviour
3.  very strict, rigid, or severe; drastic: an extreme measure
4.  (prenominal) farthest or outermost in direction: the extreme boundary
5.  meteorol of, relating to, or characteristic of a continental climate
6.  the highest or furthest degree (often in the phrases in the extreme, go to extremes)
7.  (often plural) either of the two limits or ends of a scale or range of possibilities: extremes of temperature
8.  maths
 a.  the first or last term of a series or a proportion
 b.  a maximum or minimum value of a function
9.  logic the subject or predicate of the conclusion of a syllogism
[C15: from Latin extrēmus outermost, from exterus on the outside; see exterior]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-15c., from L. extremus "outermost, utmost," superlative of exterus (see exterior). In English as in Latin, not always felt as a superlative, hence more extreme, most extreme (which were condemned by Johnson). The noun is first recorded 1540s, originally of the end of
life, cf. Latin in extremis. Extreme unction preserves the sense of last, latest (15c.). As a noun, c.1600, in in the extreme, etc. Extremes opposite ends of anything is from 1550s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
extreme   (ĭk-strēm')  Pronunciation Key 
  1. Either the first or fourth term of a proportion of four terms. In the proportion 2/3 = 4/6 , the extremes are 2 and 6. Compare mean.

  2. A maximum or minimum value of a function.

The American Heritage® Science Dictionary
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