Origin: 1350–1400;Middle English < Late Latincommentātor interpreter, equivalent to commentā(rī) to interpret (Latin: to think about, prepare, discuss, write, perhaps frequentative of comminīscī to devise; see comment) + Latin-tor-tor
mid-15c., "writer of commentaries," from comment or commentary (L. commentator meant "inventor, author." Meaning "writer of notes or expository comments" is from 1640s; "one who gives commentary" (originally in sports) is from 1928.