noun.
Steel in the form of flat plates used in making steam boilers.
noun.
Journalistic material, such as syndicated features, made available by agencies in a form that is already typeset, originally in plate form, for easy incorporation into publications such as newspapers.
noun.
Hackneyed or conventional language, usually expressing a generally accepted viewpoint.
noun.
Standardized or set language that is meant to be used repeatedly, often in organizational publications or legal documents.