Extremely interesting or engaging, capturing one's complete attention. Can also describe the physical process of taking in or soaking up substances.
From Latin 'absorbere' meaning 'to swallow up', composed of 'ab-' (away) + 'sorbere' (to suck in). The figurative sense of capturing attention developed from the literal meaning of complete intake.
The metaphorical leap from physical absorption to mental engagement is brilliant - when something is truly absorbing, it literally 'sucks up' all our attention just like a sponge soaks up water. This shows how our minds naturally understand attention as a finite resource that can be completely consumed.
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