The term 'entire quantity' can be represented by the crossword solution 'TOTAL' (5 letters). The word 'TOTAL' is an adjective meaning 'being or constituting the full quantity or extent; complete; entire; full'. It is often used to refer to the sum of all parts, such as the TOTAL amount of money spent on a purchase. In this context, it can be used to describe the entirety of a quantity, such as the TOTAL number of items in a collection.