adjective
a term used to describe something related to or characteristic of a brother or brothers, particularly in a fraternal or close-knit sense
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The Adelphian Society was founded in 1904 at the University of Michigan.
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I heard that the Adelphian group is having a meeting tonight.
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Are you part of the Adelphian crew?
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The bond between the two friends was so strong, it was almost adelphian in nature.