An architect holds responsibility for the solution to a problem.
He also documents the system, its subsystems and relationships between subsystems.
Included are also the principles that govern subsequent development.
His documentation contains the model that serves as input for those that will develop the required system.
In my view, an information architect holds responsibility for all information that is related to the system. And not just the data that the system operates on. Another title for this role is Meta Architect, Knowledge Architect or Information Asset Manager.
The objective of the architect is to provide documentation (presentations) that is precise, concise and free of errors, such that the right system will be built that meets the requirements.
Architecting is supported by a method or approach with built-in quality, that is customized to the needs of the client.
Some architecture humour