[op-uh-zit, -sit]
situated, placed, or lying face to face with something else or each other, or in corresponding positions with relation to an intervening line, space, or thing: opposite ends of a room.
contrary or radically different in some respect common to both, as in nature, qualities, direction, result, or significance; opposed: opposite sides in a controversy; opposite directions.
being the other of two related or corresponding things: friendly with many members of the opposite sex.
situated on diametrically opposed sides of an axis, as leaves when there are two on one node.
having one organ vertically above another; superimposed.
adverse or inimical.
a person or thing that is opposite or contrary.
an antonym.
Archaic. an opponent; antagonist.
across from; facing: The guest of honor sat opposite me at the banquet.
in a role parallel or complementary to: He has played opposite many leading ladies.
on opposite sides.
on the opposite side: I was at one end and she sat opposite.
to the opposite side; in the opposite direction: I went to the left balcony, and he went opposite.

1350–1400; Middle English < Middle French < Latin oppositus, past participle of oppōnere to set against. See oppose, -ite2

oppositely, adverb
oppositeness, noun
subopposite, adjective
suboppositely, adverb
suboppositeness, noun

1. facing. 2. incompatible, irreconcilable, unlike, differing. Opposite, contrary, reverse imply that two things differ from each other in such a way as to indicate a definite kind of relationship. Opposite suggests symmetrical antithesis in position, action, or character: opposite ends of a pole, sides of a road, views. Contrary sometimes adds to opposite the idea of conflict or antagonism: contrary statements, beliefs. Reverse suggests something that faces or moves in the opposite direction: the reverse side of a coin; a reverse gear.

2. same, like.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opposite (ˈɒpəzɪt, -sɪt)
1.  situated or being on the other side or at each side of something between: their houses were at opposite ends of the street
2.  facing or going in contrary directions: opposite ways
3.  diametrically different in character, tendency, belief, etc: opposite views
4.  botany
 a.  (of leaves, flowers, etc) arranged in pairs on either side of the stem
 b.  (of parts of a flower) arranged opposite the middle of another part
5.  maths
 a.  (of two vertices or sides in an even-sided polygon) separated by the same number of vertices or sides in both a clockwise and anticlockwise direction
 b.  opp (of a side in a triangle) facing a specified angle
6.  a person or thing that is opposite; antithesis
7.  maths the side facing a specified angle in a right-angled triangle
8.  a rare word for opponent
9.  Also: opposite to facing; corresponding to (something on the other side of a division): the house opposite ours
10.  as a co-star with: she played opposite Olivier in ``Hamlet''
11.  on opposite sides: she lives opposite

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

1391, "placed on the other side of (something)," from O.Fr. oposite (13c.), from L. oppositus, pp. of opponere "set against" (see opponent). Meaning "contrary in nature or character" is from 1580.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
opposite   (ŏp'ə-zĭt)  Pronunciation Key 

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Arranged as one of a pair on either side of a stem or twig. Maple and ash trees have opposite leaves. Compare alternate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Talk diversity all you want, but also respect the rights of others whose views
  are the polar opposites of yours.
Their tops and bottoms relate as opposites in an utterly surprising manner.
Hopefully at some point the moderation between these supposedly polar opposites
  will come to be the trend.
He then makes a huge logical blunder in imagining that affect and complexity
  are binary opposites, mutually exclusive.
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