1) A series of comments, explanations, or annotations (Dictionary.com).
2) An explanatory essay or treatise (Dictionary.com).
From M.E. commentaries (plural), from L. commentarium "notebook,"
noun use of neuter of commentarius, from comment(um),
→ comment, + -arium, → -ary.
Hâmatgân, from hâmat, → comment, + gân
suffix forming plural entities, from Mid.Pers. -gânag, -gâna.
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