“The word for a Roman soldier survived the empire by two thousand years and now names a French soldier fighting in Africa, a veterans' organization in America, and a disease caught from air conditioning.”
Legionnaire comes from Latin lēgiōnārius, meaning 'of or belonging to a legion,' from legiō (legion), from legere (to gather, to choose). A Roman legion was a unit of about 5,000 soldiers — the word originally meant 'a gathering of chosen men.' A legionnaire was one of those chosen men. The word carried connotations of professionalism, discipline, and long service.
The French Foreign Legion, founded in 1831 by King Louis-Philippe, revived the word. The légionnaire was a soldier in a force that accepted volunteers of any nationality, no questions asked. The Legion fought in Algeria, Indochina, Mexico, and both world wars. Its legionnaires were famously tough, anonymous, and willing to die for a country that was not their own. The word acquired romantic and sinister connotations simultaneously.
The American Legion, founded in 1919, applied the word to veterans rather than active soldiers. An American legionnaire is a veteran of the U.S. military who has joined a service organization. The word shifted from describing a type of soldier to describing a type of civilian who had once been a soldier. The American Legion Auxiliary Hall became a fixture of small-town America.
In 1976, a mysterious illness killed 34 people at an American Legion convention in Philadelphia. The disease was caused by a previously unknown bacterium, Legionella pneumophila, which had colonized the hotel's air conditioning system. It was named Legionnaires' disease — not because legionnaires were uniquely susceptible, but because the convention was where the outbreak was first identified. The word for a Roman soldier now also names a pneumonia caused by hotel plumbing.
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Legionnaire carries three meanings simultaneously. A French Foreign Legion soldier serving in Mali. An American veteran attending a post meeting. A patient with a respiratory infection caused by Legionella bacteria. The Roman word for a chosen soldier now means all three of these things.
The word survived because it was useful, not because it was remembered. Latin died. The legion dissolved. But the word for a professional soldier kept finding new soldiers to name. It will keep finding them. There are always more wars, more veterans, and more air conditioning systems.
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