A possessive or plural form relating to gentlemen (often found in proper nouns like 'Gentlemen's Agreement' or business names).
From 'gentleman' + possessive '-'s' or informal plural, creating a form commonly used in titles and proper nouns rather than standard grammatical constructions.
In modern English, 'gentlemen's' appears mainly in set phrases like 'gentlemen's agreement' (an informal understanding based on honor rather than law), which shows how the term has become almost idiomatic.
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