From The Collaborative International Dictionary of English v.0.48 [gcide]:
Usage: Any denotes one, or some, taken indifferently from the individuals which compose a class. Every differs from each in giving less prominence to the selection of the individual. Each relates to two or more individuals of a class. It refers definitely to every one of them, denoting that they are considered separately, one by one, all being included; as, each soldier was receiving a dollar per day. Every relates to more than two and brings into greater prominence the notion that not one of all considered is excepted; as, every soldier was on service, except the cavalry, that is, all the soldiers, etc.
From WordNet (r) 3.0 (2006) [wn]:
1: (used of count nouns) each and all of the members of a group considered singly and without exception; "every person is mortal"; "every party is welcome"; "had every hope of success"; "every chance of winning"
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