To manage, distribute, or oversee something together with another person; to jointly administer.
From co- + administer (to manage, conduct, dispense). This verb combines the Latin prefix co- with the Latin administrare (to serve, manage), and became common in legal and governmental texts describing shared governance.
When two school principals 'coadminister' a school district, they're both officially in charge—this sharing of power is a modern organizational strategy with ancient roots!
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