The Greek noun taxis (τάξις) means order, proper arrangement, fixed sequence, or established rank. It derives from tassō (to arrange, appoint). It describes orderly sequencing — whether of priestly courses, the orderly conduct of worship, the rank of Melchizedek's priesthood, or the sequence of resurrection. In military contexts it describes battle formation.
The most theologically significant use of taxis is in the phrase 'according to the order (taxis) of Melchizedek' (Hebrews 5:6, 10; 6:20; 7:11, 17, 21), drawn from Psalm 110:4. This phrase is the heart of Hebrews' argument for the superiority of Christ's high priesthood. The Levitical order was temporary and imperfect; Christ's priestly taxis is eternal, like Melchizedek's — not based on genealogy but on divine appointment and indestructible life. Paul also uses taxis in 1 Corinthians 14:40 ('everything should be done in a fitting and orderly way') to address charismatic worship. God is a God of order, and the Spirit's gifts must be expressed within loving, orderly structure.