The quality or state of being brotherly; the condition of belonging to a group bound by common interests or purpose.
From Latin 'frater' (brother) + '-ity' (state or quality). The word evolved from the concept of fraternity but with a more archaic or rare form emphasizing the abstract quality of brotherhood itself.
While 'fraternity' is common today, 'fratority' is a forgotten ghost-word that linguists occasionally encounter in medieval texts—it shows how English speakers once had multiple ways to describe brotherliness, much like how we once had 'kine' alongside 'cows.'
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