Also means
Londoner
Usage Note
Londonien describes anything from or relating to London — un accent londonien, la vie londonienne. As a noun, un Londonien / une Londonienne means a person from London. It follows the standard pattern for city-derived adjectives in French (parisien, new-yorkais).
Examples
"Il adore l'ambiance londonienne."
Natural Translation
He loves the London atmosphere.

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