Longman Dictionary of Contemporary English - dense

~ adj 1 »CLOSE TOGETHER« made of several things that are closely packed together  (He forced his way through the dense crowd. | Dense jungle covered the whole area.) 2 »SMOKE/MIST« difficult to see through or breathe in  (dense fog | a dense black cloud) 3 »STUPID« informal not able to understand things easily; stupid  (Oh, don't be so dense!) 4 »WRITING« a dense piece of writing is difficult to understand because it contains a lot of information or uses complicated language 5 »SUBSTANCE« technical a substance that is dense has a lot of mass1 (6) in relation to its size  (Water is eight hundred times denser than air.) - densely adv  (a densely populated area) - denseness n density ~ n 1 the degree to which an area is filled with things or people  (population density) 2 technical the relationship between something's mass1 (6) and its size.