The condition or state of being united as a federal system; the act of uniting separate regions into one federation.
English formation from federal (from Latin foedus meaning 'covenant') plus the suffix -acy, borrowed from Latin -acia, meaning 'state or condition.'
This archaic word reminds us that before America became 'the United States,' people weren't sure what to call this weird new idea of states staying independent but sharing a government together.
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