1. Pleasing or sweet sound, the acoustic effect produced by words so formed and combined as to please the ear; especially, a harmonious succession of words having a pleasing sound or striking the ear as being appropriate to the meaning; opposed to cacophony.
2. Tendency to greater ease of pronunciation resulting in regularly observed combinative changes that seem to be caused by increased speed of utterance and economy of effort; as an adjective, euphonic.
3. The quality of having a pleasant sound; the pleasing effect of sounds free from harshness; chiefly with reference to combinations of words in sentences, or of phonetic elements in spoken words.
4. In recent philological use often the tendency to greater ease of pronunciation, as shown in those combinatory phonetic changes formerly ascribed to an endeavour after a pleasing acoustic effect.