To feel sorry about (a thing that has or has not happened), afterthink: to wish that a thing had not happened, that something else had happened instead.
He regretted his words.
To miss; to feel the loss or absence of; to mourn.
He more than ever regretted his home, and with increased desire longed to see his family.
From Middle English regretten, regreten, from Old French regreter, regrater (“to lament”), from re- (intensive prefix) + *greter, *grater (“to weep”), from Frankish *grātan (“to weep, mourn, lament”),...
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Dislike; aversion.
Is it a vertue to have some ineffective regrets to damnation, and such a Vertue too, as shall serve to ballance all our vices?
The amount of avoidable loss that results from choosing the wrong action.
Under squared errorloss we show that there exists unique minimax regret solution for the problem of selecting the threshold.