Strong's Greek Dictionary
πρῶτος (proton)
neuter of 4413 as adverb (with or without 3588); firstly (in time, place, order, or importance)
neuter of 4413 as adverb (with or without 3588); firstly (in time, place, order, or importance):--before, at the beginning, chiefly (at, at the) first (of all). see GREEK for 4413 see GREEK for 3588
James Strong, Strong's Greek Dictionary (1890) — public domain