Showing the kind affection, loyalty, or support that a brother typically shows, or relating to brothers.
From Old English 'brothor' (brother) with the suffix '-ly' meaning 'like' or 'in the manner of.' The concept evolved from describing actual sibling relationships to describing any caring, loyal behavior.
The term 'brotherly love' is so culturally significant that Philadelphia is nicknamed 'the City of Brotherly Love'—and it was chosen because of Quaker William Penn's ideal of tolerant, affectionate community, showing how a family concept expanded to define an entire city's values.
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