a fighter's gear: a weapon, and in the plural the whole kit of arms and armor someone carries into battle
The word names the equipment of a fighter. One of them is a single weapon; the plural, which is the only form the New Testament uses, covers the whole outfit at once, the blade a soldier strikes with and the shield he hides behind. Greek writers could stretch it further still, to a workman's tools or a ship's rigging, so the idea underneath is gear for a job rather than a blade in particular.
Only once does it mean ordinary weapons in ordinary hands, when the party that arrests Jesus comes at night with lanterns, torches, and arms. Every other use belongs to Paul, and each one turns the word into a picture of a fight over a person's loyalty:
- In Romans 6:13 the parts of a person's body are the weapons, handed over either to sin or to God.
- In Romans 13:12 the gear is put on like clothing, the equipment that belongs to daylight.
- In 2 Corinthians 6:7 it is carried in both hands, on the right and on the left, ready to strike and to guard.
- In 2 Corinthians 10:4 it is named as gear of another order, not the ordinary human kind, yet strong enough to pull down fortifications.
That is the force of the word for Paul. His question is never whether a person is armed but whose army the arms belong to. The related word for a soldier's complete set of equipment (πανοπλία) makes the same move in Ephesians, and the short sword (μάχαιρα) names one piece of the kit; this is the general word, whatever a fighter takes up.