Boyd’s Bible Dictionary:
Plunder seized by violence, as the spoils of an army or of bandits
(1 Sam. 30:19-22); but in Ex. 3:22, the sense is that of recovery without violence of unjustly taken property. David instituted very strict regulations for the division of spoils of war among his soldiers (1 Sam. 30:20-25).
Concise Bible Dictionary:
The booty that was seized upon by an army when a city was taken. Except when forbidden by God, as in the case of Jericho, it was considered a lawful prize; and it was thus the Israelites suffered when their cities were captured by their enemies (Deut. 20:14; 2 Kings 21:14; Isa. 42:22).
Strong’s Dictionary of Greek Words:
Meaning:
neuter from 4660; something stripped (as a hide), i.e. booty