- of, relating to, or befitting a son or daughter: filial obedience.
- noting or having the relation of a child to a parent.
- pertaining to the sequence of generations following the parental generation, each generation being designated by an F followed by a subscript number indicating its place in the sequence.
- of, resembling, or suitable to a son or daughter
- designating any of the generations following the parental generation; F 1 indicates the first filial generation, F 2 the second, etc
