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comparative more filial, superlative most filial
(not comparable) Pertaining to or befitting a son or daughter. quotations examples
The filial duty Ellesmere had paid to a father, who had no other claim to it than that he was his father, was now consoling to him [D'Alonville]; […]
1794, Charlotte Smith, “Chapter 20”, in The Banished Man, volume 2
(comparable) Respectful of the duties and attitudes of sons or daughters toward their parents. quotations examples
If the admonition [to the parent] does not take effect, the son will be more reverential and more filial; […]
1885, The actions and Attitude of Filiality, (Please provide the book title or journal name), translation of original by ConfuciusJames Legge
(genetics) Of a generation or generations descending from a specific previous one. quotations examples
This, following Bateson, we may call the parental generation or P generation. Subsequent generations are called filial generations (abbreviated F) and their numerical order is indicated by a subscript, as first filial (F1), second filial (F2), etc.
1916, William E. Castle, Gregor Mendel, Genetics & Eugenics, page 101