Meaning of “army” - Learner’s Dictionary

army

noun [ C ] uk us /ˈɑːmi/
MILITARY GROUP

B1 a military force that fights wars on the ground:

the British Army
an army officer/base
ORGANIZED GROUP

a group of people that is organized to do the same job:

an army of cleaners/helpers

(Definition of “army” from the Cambridge Learner’s Dictionary © Cambridge University Press)