FILIAL Meaning of FILIAL in English adj. 1 of or due from a son or daughter. 2 Biol. bearing the relation of offspring (cf. F(2) 5). filially adv.[ ME f. OF filial or LL filialis f. filius son, filia daughter ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012