A declaration of the principles upon which a person, a sect, or a party proposes to stand; a declared policy or system; as, the Saybrook platform; a political platform.

the formal statement of a political party's beliefs and goals.

a national party's goals and views on important domestic and foreign policy issues

A formal declaration of the principles on which a group, such as a political party, makes its appeal to the public

a formal written document that states a political party's stances on important issues and its goals for the future.

In the context of U.S. presidential politics, this term refers to a political party’s formal written statement of its principles and goals, put together and issued during the presidential nomination process. While Democratic and Republican nominees for president have traditionally paid lip service to their party’s platform, these lofty, legalistic documents have become less important in recent years as television has focused more on each candidate’s appearance, personality, and perceived leadership ability.

set of opinions and ideas for policy, upon which the members of a political party decide. Party members often determine their platforms in caucuses.

Platforms, in European politics, are openly organized political factions within left-wing political parties. Examples include the Republican Communist Network, the Workers Unity Platform and the Solidarity Tendency, platforms within the Scottish Socialist Party; the Socialist Workers Platform and the Committee for a Workers' International platform, both Trotskyist platforms formerly within the Scottish Socialist Party and now part of Solidarity (Scotland); and the "plateformes" 1 through 4 of the Revolutionary Communist League (Ligue communiste révolutionnaire - LCR) in France. Such groups in American left-wing political organizations are usually called tendencies or caucuses.