noun
the ability of a material to absorb radiation or sound
adjective
absorptive
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The absorptivity of the material determines how much light it can absorb.
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The absorptivity of this fabric is really high, it soaks up spills like a sponge.
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I can't believe the absorptivity of that paper towel, it's like magic!
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Her absorptivity towards new ideas is impressive, she always takes in information like a sponge.