Casual describes something relaxed, informal, or happening by chance rather than by plan. It can describe clothing, conversations, or attitudes that are not strict or serious.
From Late Latin 'casualis' meaning 'by chance' or 'accidental', from Latin 'casus' meaning 'chance' or 'fall'. Over time, the idea of 'by chance' softened into the modern sense of 'relaxed' or 'informal'.
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