Also means
multitude, great number
Usage Note
Légion refers historically to a Roman military unit and today to organized military or police corps such as the Légion étrangère (Foreign Legion). The fixed expression ils sont légion means 'there are countless of them' — note the noun is used predicatively with no article in this idiom.
Examples
"Les volontaires sont légion dans cette région."
Natural Translation
Volunteers are legion in this region.

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