The TOGAF standard definition for an Architecture Framework is
A conceptual structure used to develop, implement, govern and sustain an ArchitectureTOGAF Standard Definition
To expand on the TOGAF definition, think of an Architecture Framework as:
- A set of structures which are able to be used to develop a wide range of differing Architectures.
- An Architecture Framework should describe a way to design a set of of building blocks (And their relationships) in terms of the state of an enterprise.
- There should be a set of standards, guidelines and compliant products on which the building blocks can be implemented.
- There should be a common vocabulary and set of tools.