accessory accident accidental accidentality actuarial calculation addendum addition adjunct adventitiousness adventure appendage appurtenance auxiliary break casualness casualty chance chance hit circumstance collateral contingency contingent destiny episode event experience extra fact fate fluke flukiness fortuitousness fortuity fortune freak accident gamble good fortune good luck hap happening happy chance hazard heedless hap how they fall incident incidental indeterminacy indeterminateness inessential law of averages long odds long shot lot luck lucky shot matter of fact mere chance moira nonessential not-self occasion occurrence opportunity other particular phenomenon principle of indeterminacy probability problematicness random sample reality risk run of luck secondary serendipity statistical probability subsidiary superaddition supplement the breaks theory of probability turn of events uncertainty uncertainty principle unessential whatever comes