The act or process of plunging, dipping, or submerging something beneath a liquid surface.
From Latin demersio, the noun form of demergere. The -sion ending indicates an action or result, following the same pattern as 'immersion' and 'submersion.'
While 'immersion' is common, 'demersion' is its sophisticated older cousin that emphasizes the downward push rather than just the state of being submerged—it's action-focused and rarely heard anymore.
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