ABAP Keyword Documentation →  ABAP Glossary → 

ABAP Dictionary

Persistent repository for data types that are visible in all repository objects. Among other things, the database tables of the central database, views, and lock objects are managed in ABAP Dictionary. The objects in ABAP Dictionary are maintained using the tool of the same name in ABAP Workbench. ABAP Dictionary is called using transaction code SE11.

More