In a manner showing proper respect and affection for one's parents; as a dutiful son or daughter would act.
From 'filial' (Latin 'filialis', from 'filius' meaning 'son') + '-ly' (adverbial suffix). Describes actions taken in the spirit of filial duty.
You'd use 'filially' when describing someone honoring their parents—it's rare in English but super important in cultures where filial piety is central to morality and society!
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