amount
Synonym discussion
Sense: noun/1
'Amount' is the normal word for how much of something there is when we think of it as a mass: an amount of water, time, money, or damage. 'Quantity' is close, but feels more formal and often appears in science, measurement, or instructions. 'Number' is different because it is mainly for individually countable items: a number of students, reasons, or chairs. 'Sum' is narrower still and usually points to money or figures after addition. 'Volume' often suggests a large amount, especially of liquid, trade, or activity. So you would say an amount of sugar, a number of books, a sum of 5,000 dollars, and a high volume of calls.
Common collocations
Etymology
'Amount' first came into English as a verb in the Middle English period from Anglo-French forms related to Old French 'amont', meaning 'upward'. That French word came from a phrase meaning 'toward the mountain', built from Latin 'ad' and 'mons'. The earliest idea was one of rising or increasing. From that, English developed the later meanings of reaching a total, being equal in effect, and finally the noun sense of a quantity or sum.