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"Chargé d'affaires" generally follows French usage: "chargé d'affaires" is singular, "chargés d'affaires" for plural. The "d'affaires" is always in the plural form, and should be lowercase even if "Chargé" is capitalized. Following the French declension, "chargée d'affaires" (with the feminine ending) may be seen where the "chargé" is female.