I am new to using the SQL Data Modeler and I was wondering if someone could point me to a list of definitions of terms that are used throughout the SQL Data Modeler interface. The help documentation does not seem to define most of the terms that are used in the product.
The Oracle SQL Developer Data Modeler help and the Data Modeler User's Guide, which shares content with the help, don't contain a glossary or list of terms. If the terms you're looking for are Oracle Database terms (such as definitions of tables and other database objects), the SQL Developer help and its user's guide do include brief definitions (in the Database Objects topic).
For other kinds of terms, the Data Modeler help does point to the Object Management Group (OMG) site, and perhaps the OMG Terms and Acronyms page ( http://www.omg.org/gettingstarted/terms_and_acronyms.htm) might help you. However, there's no guarantee that those definitions will completely apply to the Oracle SQL Developer Data Modeler tool.
For definitions or explanations of specific terms of interest, I recommend searching for (or using the Table of Contents to find) the relevant topics. You can also ask about specific terms or about terms in general in the Data Modeler discussion forum: SQL Developer Data Modeler forum: SQL Developer Data Modeler