Etymology
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brotherly (adj.)

Old English broðorlic "of or pertaining to a brother;" see brother + -ly (1). Meaning "fraternal, kind, affectionate" is from 1530s.

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Definitions of brotherly
1
brotherly (adv.)
(archaic as adverb) in a brotherly manner;
2
brotherly (adj.)
like or characteristic of or befitting a brother;
brotherly feelings
Synonyms: brotherlike / fraternal
From wordnet.princeton.edu