accidentality actuarial calculation adjunct adventitiousness barometer break casualness chance component contingent cross section destiny detachment detail division dole fate feeler flukiness fortuitousness fortuity fortune fraction gamble good fortune good luck hap happenstance happy chance heedless hap how they fall indeterminacy indeterminateness installment item law of averages lot luck moira opportunity parcel part particular percentage pilot balloon portion principle of indeterminacy probability probe problematicness quadrant quarter quota remainder risk run of luck sample sampling section sector segment serendipity share sound sounder statistical probability straw vote subdivision subgroup subspecies the breaks theory of probability trial balloon uncertainty uncertainty principle weather vane weathercock whatever comes