From Middle English brotherly, from Old English brōþorlīċ, from Proto-Germanic *brōþērlīkaz, equivalent to brother + -ly. Cognate with Dutch broederlijk (“brotherly”), German brüderlich (“brotherly”), Swedish broderlig (“brotherly”).
- Of or characteristic of brothers.
- brotherly love
of or characteristic of brothers
- In the manner of a brother, as a brother, as brothers.
1907, Jack London, The Iron Heel:
- "What honest man, who is not insane, would take lost women and thieves into his house to dwell with him sisterly and brotherly?"