Present participle of 'chairman' as a verb; serving as or acting in the role of chairman; presiding over a meeting or organization.
From 'chairman' + '-ing' (present participle suffix from Old English 'ung'). This form represents the ongoing action of serving as chairman, though modern English favors 'chairing' as more concise.
The shift from 'chairmaning' to 'chairing' shows how English streamlines longer words—'chairing' is shorter, easier to say, and doesn't require unpacking what 'man' has to do with presiding.
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