Definition
A number is how many there are of separate things you can count one by one — people, errors, marbles, days. Each unit is distinct, so you tally them rather than weigh or measure them, and the result is exact: three, forty, a thousand. It goes with 'many' and 'fewer' (a large number, a small number). From Latin numerus. Set it against amount, which is for a single uncountable mass. To say 'a number of' is a quiet way to say 'several' without fixing exactly how many.
Examples
- A growing number of students now study online rather than on campus.
- The number of errors fell sharply once the team began to scrutinize each draft.
- Only a small number of species can adapt to such bitter cold.
Collocations
a number of·a large number of·the total number·a growing number of·number of times
Synonyms
quantity·count·total·tally·sum
See also
- number vs amountconfusing words
Word family
numerous (adjective)·numerical (adjective)·enumerate (verb)
In TOEFL & IELTS
Number goes with countable nouns and takes many/fewer: 'the number of mistakes', 'a number of reasons'. The trap is swapping it with amount, which is for uncountable mass nouns (amount of water, not number of water; number of bottles, not amount of bottles) — the same logic behind fewer vs less. 'A number of' also reads as 'several', useful for hedging in academic writing.