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Etymology
From.

Adverb

 * 1) accidentally, incidentally, by chance
 * 2) randomly

Adverb

 * 1) accidentally, by accident
 * 2) randomly, casually
 * 3) by chance, unpredictably
 * 4) by any chance
 * 1) by chance, unpredictably
 * 2) by any chance
 * 1) by any chance