com·men·ta·tion \ˌkämən.ˈtāshən, -ˌmen-\noun (-s) Etymology: Middle French or Latin; Middle French, commentary, from Latin commentation-, commentatio meditation, treatise, from commentatus (past participle of commentari to meditate upon) + -ion-, -io -ion 1.obsolete: a commentary especially on a text 2.archaic: the act of commenting : interpretation or expression of opinion