Possessive form of 'chairman'; belonging to or associated with a chairman; relating to the chairmanship.
From 'chairman' + possessive 's'. This construction is grammatically correct though somewhat archaic; modern usage prefers 'the chairman's' or simply 'chairperson's.'
The possessive 'chairman's' reminds us that 'chairman' is still treated as a single word, not a compound—it's why we say 'chairman's office' not 'chair-man's office,' showing how language groups words into units.
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