accentyoudaoicibaDictYouDict[accent 词源字典]
accent: [14] Accent was originally a loantranslation from Greek into Latin (a loantranslation is when each constituent of a compound in one language is translated into its equivalent in another, and then reassembled into a new compound). Greek prosōidíā (whence English prosody) was formed from pros ‘to’ and ōidé ‘song’ (whence English ode); these elements were translated into Latin ad ‘to’ and cantus ‘song’ (whence English chant, cant, cantata, canticle), giving accentus.

The notion underlying this combination of ‘to’ and ‘song’ was of a song added to speech – that is, the intonation of spoken language. The sense of a particular mode of pronunciation did not arise in English until the 16th century.
=> cant, cantata, canticle, chant[accent etymology, accent origin, 英语词源]
accent (n.)youdaoicibaDictYouDict
late 14c., "particular mode of pronunciation," from Middle French accent, from Old French acent (13c.), from Latin accentus "song added to speech," from ad- "to" (see ad-) + cantus "a singing," past participle of canere "to sing" (see chant (v.)). Loan-translation of Greek prosoidia, from pros- "to" + oide "song," which apparently described the pitch scheme in Greek verse. The decorating sense of "something that emphasizes or highlights" is from 1972.
accentuate (v.)youdaoicibaDictYouDict
1731, from Medieval Latin accentuatus, past participle of accentuare "to accent," from Latin accentus (see accent (n.)). Originally "to pronounce with an accent;" meaning "emphasize" is recorded from 1865.
You've got to accentuate the positive
Eliminate the negative
Latch on to the affirmative
Don't mess with Mister In-Between

["Ac-Cent-Tchu-Ate the Positive," 1944, music by Harold Arlen, lyrics by Johnny Mercer]
Related: Accentuated; accentuating.
circumflex (n.)youdaoicibaDictYouDict
1570s, from Latin (accentus) circumflexus, "bent around," past participle of circumflectere "to bend around," of a charioteer, "turn around" (from circum "around;" see circum-, + flectere "to bend;" see flexible); used as a loan-translation of Greek (prosodia) perispomenos (Dionysius of Halicarnassus), literally "drawn-around," with reference to shape.