Of the same kind or genus; related by having the same origin or ancestry.
From 'con-' (together) and 'generous' in its older sense meaning 'of the same kind or family.' An archaic adjective used before modern taxonomy standardized terminology.
This Victorian-era word shows how 'generous' originally meant 'of noble birth or same bloodline'—a completely different meaning from today's 'giving freely.' Language evolution is wild.
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