A form definition is an Advanced Function Presentation™ (AFP™) resource object that defines the characteristics of the physical form to be printed on, including these:
Whenever you are printing to a printer configured as AFP(*YES), a form definition is required. If you do not specify a form definition on the printer file, an inline form definition is built from the printer file parameters. If you specify a form definition, no inline form definition is built from the printer file parameters. In this case, if you send the data to an AFP printer, Print Services Facility™ (PSF) ignores some printer file parameters.
This list details the origin of AFP-related form definitions:
Related concepts
How page definitions, form definitions, and printer files interact
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Related reference