The action of immersing something in liquid or the state of being completely surrounded by or involved in something. Deep mental or physical involvement in an activity or environment.
Latin 'immersionem', from 'immergere' (to dip into, plunge into), from 'im-' (into) + 'mergere' (to dip, plunge). Originally a physical term for baptism and liquid submersion, extended metaphorically to mental engagement by the 17th century.
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