A very large number of things grouped together
Military land forces
A unit of an army, sense 1
Any large group
I scouted for the army a few years.
I have four sons in the army but still I don't fret.
His army was the greatest that the Romans had ever seen.
There is an army of people who would kill for what you possess.
We don't have the people or supplies to sustain ourselves on the regular army side.