Not a standard English word; possibly meaning thoroughly rapt or deeply absorbed/engrossed.
Hypothetical: be- prefix (thoroughly) + rapt (from Latin raptus 'seized/carried away'), but this combination is not documented in standard dictionaries.
Be- is such a productive prefix that we can understand berapt instantly (it should mean 'thoroughly rapt'), but English speakers prefer to say 'completely rapt' or 'utterly absorbed'—we've stopped making be- words.
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