a horizontal surface or structure with a horizontal surface raised above the level of the surrounding area.
a raised flooring or other horizontal surface, such as, in a hall or meeting place, a stage for use by public speakers, performers, etc.
the raised area between or alongside the tracks of a railroad station, from which the cars of the train are entered.
the open entrance area, or the vestibule, at the end of a railroad passenger car.
a landing in a flight of stairs.
a public statement of the principles, objectives, and policy of a political party, especially as put forth by the representatives of the party in a convention to nominate candidates for an election: The platform contained the usual platitudes.
a body of principles on which a person or group takes a stand in appealing to the public; program: The Fabians developed an all-embracing platform promising utopia.
a set of principles; plan.
a place for public discussion; forum.
a decklike construction on which the drill rig of an offshore oil or gas well is erected.
Building Trades. a relatively flat member or construction for distributing weight, as a wall plate, grillage, etc.
solid ground on which artillery pieces are mounted.
a metal stand or base attached to certain types of artillery pieces.
Nautical, flat1 ( def 42a ).
a flat, elevated piece of ground.
Geology. a vast area of undisturbed sedimentary rocks that, together with a shield, constitutes a craton.
a thick insert of leather, cork, or other sturdy material between the uppers and the sole of a shoe, usually intended for stylish effect or to give added height.
platforms, platform shoes.
a scheme of religious principles or doctrines.

1540–50; earlier platte forme < Middle French: literally, flat form, plane figure. See plate1, form

platformless, adjective

2. stage, dais, rostrum, pulpit. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
platform (ˈplætfɔːm)
1.  a raised floor or other horizontal surface, such as a stage for speakers
2.  a raised area at a railway station, from which passengers have access to the trains
3.  drilling platform See production platform
4.  the declared principles, aims, etc, of a political party, an organization, or an individual
5.  a level raised area of ground
6.  a.  the thick raised sole of some high-heeled shoes
 b.  (as modifier): platform shoes
7.  a vehicle or level place on which weapons are mounted and fired
8.  a specific type of computer hardware or computer operating system
[C16: from French plateforme, from plat flat + forme form, layout]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1550, "plan of action, scheme, design," from M.Fr. plate-forme, lit. "flat form," from O.Fr. plate "flat" (see plat) + forme "form" (see form). The literal sense of "raised, level surface" is first recorded 1560. Political meaning, "statement of party
policies," is from 1803, probably originally an image of a lit. platform on which politicians gather, stand, and make their appeals, perhaps influenced by earlier sense of "set of rules governing church doctrine" (first attested 1573). Railroad station sense is from 1838.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
platform   (plāt'fôrm')  Pronunciation Key 
  1. The basic technology of a computer system's hardware and software, defining how a computer is operated and determining what other kinds of software can be used. Additional software or hardware must be compatible with the platform.

  2. The part of a continent's craton (the ancient, relatively undisturbed portion of a continental plate) that is covered by flat or nearly flat strata of sediment.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

platform definition

A political party's or candidate's written statement of principles and plans. A platform is usually developed by a committee at the party convention during a presidential campaign.

platform definition

The combination of computer hardware and operating system that applications must be compatible with.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

platform definition

Specific computer hardware, as in the phrase "platform-independent". It may also refer to a specific combination of hardware and operating system and/or compiler, as in "this program has been ported to several platforms". It is also used to refer to support software for a particular activity, as in "This program provides a platform for research into routing protocols".

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
At the center of the stage was a rotating platform on which, it was announced, hundreds of smaller items would be displayed.
She's not afraid to use that platform to critique the others on stage-even as she's handing them a trophy.
Success in fostering economic links and lowering political and military tensions will be a main campaign platform.
Presidential candidates have a history of conforming to the party platform when
  the time comes.
Images for platform
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