Armament, n.
Etymology: [L. armamenta, pl., utensils, esp. the tackle of a ship, fr. armare to arm: cf. LL. armamentum, F. armement.]
1. A body of forces equipped for war; -- used of a land or naval force. "The whole united armament of Greece." Glover.
2. (Mil. & Nav.)
All the cannon and small arms collectively, with their equipments, belonging to a ship or a fortification.
3. Any equipment for resistance.
Shades of meaning
Fernald has no entry of its own for armament; he lists it under army.
He lists it without comment; the entries above explain its neighbors.