Definitions:

1. Used to introduce specific examples, details, or clarification of something just mentioned. ADVERB
   • She enjoys outdoor activities, namely hiking, biking, and kayaking.
2. Used when you want to give more detail or be more exact about something you have just said. ADVERB
   • I learned an important lesson when I lost my job, namely that nothing is a hundred percent guaranteed.

Synonyms:

• in other words
• specifically
• that is
• that is to say
• to be exact
• to wit