Definition of legionaries:
(n) :
(military, Ancient Rome) A soldier belonging to a legion; a professional soldier of the ancient Roman army.
(n) :
A member of a legion, such as the American Legion, or of any organization containing the term legion in its title (e.g. the French Foreign Legion).
(adj) :
Relating to, or consisting of, a legion or legions.
(n) :
A person who is neither a citizen nor colonial/imperial subject of the state whose military they join.
(adj) :
Containing a great number.
(n) :
a member of the Legion of Christ, a Roman Catholic religious institute