annotation

noun5

1. •
   A critical or explanatory commentary or analysis.

   • She added an annotation in the margin to clarify the text.
2. •
   A comment added to a text.

   • The manuscript was filled with helpful annotations.
   • The teacher asked students to submit essays with proper annotation.
3. •
   Metadata added to a document or program.
4. •
   The process of writing such comment or commentary.
5. •
   Information relating to the genetic structure of sequences of bases.