principiate

The story

1. Latin · derived fromprī̆ncipium“beginning, origin; foundation, principle”
2. Late Latin · borrowed fromprī̆ncipiātus
3. English todayprincipiate

The verb is first attested in 1613, the adjective in 1654; borrowed from Late Latin prī̆ncipiātus, perfect passive participle of prī̆ncipiō (“to begin to speak, commence”) (see -ate (etymology 1, 2 and 3)), from Latin prī̆ncipium (“beginning, origin; foundation, principle”). With use as noun, compare Latin prī̆ncipiātum (“derivative of a first principle”).