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Results found in several dictionaries: Collins, Collaborative Dictionary
army 
  n 
  (=military force) armée  f  
He joined the army.   
Their father became a general in the Army.   
The army has launched a major offensive.   
Their army is poorly equipped.   
  army officer 
  (fig) 
an army of sth  une armée de qch 
an army of volunteers   
the army of television cameras outside his house   
an army of statisticians   


army base 
  n base  f  militaire 
a British army base near Hanover   
army officer 
  n officier  m  de l'armée de terre 
Red Army 
  n 
the Red Army  l'Armée  f  rouge 
Tartan Army 
  n 
*, in Scotland surnom des supporters de l'équipe nationale écossaise de football surnom des supporters de l'équipe nationale écossaise de football 
Territorial Army 
  n  (British) 
the Territorial Army  l'armée  f  territoriale 

Collaborative Dictionary     English-French
army chief n. le chef des armées Reverso General Dictionary 
hut (army) n. baraque (militaire)  
US army n. une armée américaine Reverso General Dictionary 
Royal Nepalese Army n. une Armée Royale Népalaise Reverso General Dictionary 
***
'army' also found in translations in French-English dictionary
goumier pref. Moroccan soldier in the French army Reverso General Dictionary 
armée d'armistice nm. armistice army Reverso General Dictionary 
armée de libération nm. liberation army Reverso General Dictionary 

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