When did the difference between acute and grave disappear?

Sometime between the 2nd and 4th centuries AD the distinction between acute, grave, and circumflex disappeared and all three accents came to be pronounced as a stress accent, generally heard on the same syllable as the pitch accent in ancient Greek.

1. What is the difference between a grave and an acute?
2. Where did grave accent come from?
3. What is acute accent and grave accent?
4. Does Modern Greek use accents?

What is the difference between a grave and an acute?

The difference between an acute accent and a grave accent is in their sound in the spoken word. An acute accent is spoken with a sharp pitch, while a grave accent is spoken with a loud, heavy tone. Each accent marks the stressed vowel of words in several languages.

Where did grave accent come from?

The grave accent first appeared in the polytonic orthography of Ancient Greek to mark a lower pitch than the high pitch of the acute accent. In modern practice, it replaces an acute accent in the last syllable of a word when that word is followed immediately by another word.

What is acute accent and grave accent?

The acute is used on é. It is known as accent aigu, in contrast to the accent grave which is the accent sloped the other way. It distinguishes é [e] from è [ɛ], ê [ɛ], and e [ə]. Unlike in other Romance languages, the accent marks do not imply stress in French.

Does Modern Greek use accents?

Since in Modern Greek the pitch accent has been replaced by a dynamic accent (stress), and /h/ was lost, most polytonic diacritics have no phonetic significance, and merely reveal the underlying Ancient Greek etymology.