Sounding together in harmony; characterized by consonance or pleasant agreement in sound.
From Latin co- 'together' plus sonans 'sounding.' Related to consonant, this rare variant emphasizes the togetherness of harmonious sounds rather than agreement of sounds alone.
While 'consonant' is the word we use today, 'cosonant' reveals how words describing music and harmony literally had to be invented—early musicians needed vocabulary to explain why certain notes just sounded right together.
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