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The Ancient Greek accent is believed to have been a melodic or pitch accent.
In Ancient Greek, one of the final three syllables of each word carries an accent. Each syllable contains a vowel with one or two vocalic morae, and one mora in a word is accented; the accented mora is pronounced at a higher pitch than other morae.
The accent cannot come more than three syllables from the end of the word. If the last syllable of a word has a long vowel, or is closed by two consonants, the accent usually cannot come on the antepenultimate syllable; but within those restrictions it is free.
In nouns the accent is largely unpredictable. Mostly the accent either comes as close to the beginning of the word as the rules allow, for example, πόλεμος pólemos 'war' , or it is placed on the last mora of the word, as in ποταμός potamós 'river'. But in a few words, such as παρθένος parthénos 'maiden', the accent comes between these two extremes.