quantifier; used with either mass or count nouns to indicate the whole number or amount of or every one of a class
"we sat up all night"; "ate all the food"; "all men are mortal"; "all parties are welcome"
is similar to
(used of count nouns) every one considered individually
"each person is mortal"; "each party is welcome"
is similar to
(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"
is similar to
(used as intensive) every
"every last one of you"
is similar to
each and all of a series of entities or intervals as specified
"every third seat"; "every two hours"