The state of being light-hearted, cheerful, and full of fun or merriment.
From Old French 'gaité,' derived from 'gai' (happy, lively). The word traveled from French into Middle English and retained its meaning of joy and cheerfulness throughout the centuries.
In Victorian novels, 'gaiety' was the word for fancy parties and social events—but today we'd just say 'fun' or 'party,' showing how language becomes more casual and direct over time.
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