Principiò, Aduerbium, Ter. First: first and formost: at the beginning.Principio atque animus ephebis ætate exit.Plaut.So soone as, or after that my minde was past childs age.Principiâlis & hoc principiâle, pen. prod. Lucre. That pertayneth to the beginning.
Lewis and Short: Latin dictionary
princĭpĭo, āre, v. a. [id.], to begin to speak, to begin, commence (post-class.): hoc genus principiandi, Aug. Prin. Rhet. p. 328.