n.
  - a remark expressing an opinion or reaction. ▸discussion, especially of a critical nature. 
- an explanatory note in a text. ▸archaic a written explanation or commentary. 
v.
 express an opinion or reaction.
Derivative
  
  Etymology
  ME: from L. commentum ‘contrivance’ (in late L. also ‘interpretation’), neut. past part. of comminisci ‘devise’.