dense Meaning in Cambridge American English Dictionary
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Meaning of "dense" - American English Dictionary

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denseadjective [-er/-est only]

 us   /dens/

dense adjective [-er/-est only] (THICK)

close together and difficult to go or see through; thick: dense fog I had trouble getting through the dense crowd. Dense can also mean stupid: There are some really dense people in our class.

dense adjective [-er/-est only] (CONTAINING MATTER)

science (of a substance) containing a lot of matter in a small space: Plutonium is very dense.
densely
adverb  us   /ˈdens·li/
a densely packed room
(Definition of dense from the Cambridge Academic Content Dictionary © Cambridge University Press)
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