D defs.my
Entry 1 sense Webster, 1913

Commentator

/käm'-ən-tātˌ-ẽr/ · Com·men·ta·tor · IPA /ˈkɑmənˌteɪtəɹ/
01 n. One who writes a commentary or comments; an expositor; an annotator.
  1. 1.
    One who writes a commentary or comments; an expositor; an annotator.
    “The commentator's professed object is to explain, to enforce, to illustrate doctrines claimed as true.” Whewell.