Also see definition of "Secondarily" in Word Study
Secondarily
SECONDARILY [isbe]
SECONDARILY - sek'-un-da-ri-li: the King James Version for (deuteron) (1 Cor 12:28). Probably without distinction from "secondly" (so the Revised Version (British and American), and so the King James Version also for deuteron in Sirach 23:23). Still the King James Version may have wished to emphasize that the prophets have a lower rank than the apostles.
Also see definition of "Secondarily" in Word Study