1.Definition: commonly used or supplied
"Standard procedure", "Standard car equipment"
2.Definition: conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind
"Windows of standard width", "Standard sizes", "The standard fixtures", "Standard brands", "Standard operating procedure"
3.Definition: conforming to the established language usage of educated native speakers
"Standard English", "Received standard English is sometimes called the King's English"
4.Definition: established or well-known or widely recognized as a model of authority or excellence
"A standard reference work"
5.Definition: regularly and widely used or sold
"A standard size"