1a raised level surface on which people or things can stand:there are viewing platforms where visitors may gape at the chasm
a raised floor or stage used by public speakers or performers so that they can be seen by their audience: [as modifier]:he was a popular platform speakershe was good enough to earn her living on the concert platform
a raised structure along the side of a railway track where passengers get on and off trains at a station:he walked along Platform 2
British the floor area at the entrance to a bus.
a raised structure standing in the sea from which oil or gas wells can be drilled or regulated:offshore platforms
[usually with modifier] a raised structure or orbiting satellite from which rockets or missiles may be launched:the launch platformorbiting weapons platforms
a standard for the hardware of a computer system, which determines what kinds of software it can run.
2 [usually in singular] the declared policy of a political party or group:seeking election on a platform of low taxes
an opportunity to voice one’s views or initiate action:the forum will provide a platform for discussion of communication issues
3a shoe with very thick soles:a pair of chunky platforms [as modifier]:yellow platform shoes
mid 16th century: from French plateforme 'ground plan', literally 'flat shape'
platform in other Oxford dictionaries
Definition of platform in the US English dictionary