WordReference Random House Learner's Dictionary of American English © 2015
dense /dɛns/USA pronunciation adj., dens•er, dens•est.
  1. having parts closely packed together;
    crowded:a dense forest.
  2. stupid; slow-witted.
  3. thick;
    difficult to see through:a very dense fog.
  4. difficult to understand:dense writing.
dense•ly, adv. 
dense•ness, n. [uncountable]

Collins Concise English Dictionary © HarperCollins Publishers::

dense /dɛns/ adj
  1. thickly crowded or closely set: a dense crowd
  2. thick; impenetrable
  3. having a high density
  4. stupid; dull; obtuse
  5. (of a photographic negative) having many dark or exposed areas
Etymology: 15th Century: from Latin densus thick; related to Greek dasus thickly covered with hair or leaves

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