n.
an artifact that has been created by someone or some process; "they improve their product every year"; "they export most of their agricultural production"
n.
uncertainty about the truth or factuality or existence of something; "the dubiousness of his claim"; "there is no question about the validity of the enterprise"
n.
(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature); "the rationale for capital punishment"; "the principles of internal-combustion engines"
n.
an aspect of something (as contrasted with some other implied aspect); "he was on the heavy side"; "he is on the purchasing side of the business"; "it brought out his better side"
n.
one of the portions into which something is regarded as divided and which together constitute a whole; "the written part of the exam"; "the finance section of the company"; "the BBC's engineering division"
n.
the subject matter of a conversation or discussion; "he didn't want to discuss that subject"; "it was a very sensitive topic"; "his letters were always on the theme of love"
n.
the top or extreme point of something (usually a mountain or hill); "the view from the peak was magnificent"; "they clambered to the tip of Monadnock"; "the region is a few molecules wide at the summit"
n.
one of four substances thought in ancient and medieval cosmology to constitute the physical universe; "the alchemists believed that there were four elements"
v.
decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper"