Meaning of “rate” - Learner’s Dictionary

rate

noun [ C ] uk us /reɪt/
HOW MANY

B2 how often something happens, or how many people something happens to:

the birth rate
the rate of unemployment
MONEY

B2 a fixed amount of money given for something:

the interest/exchange rate
rates of pay
SPEED

B2 the speed at which something happens:

the rate of progress
at this rate

used before saying what will happen if a situation continues in the same way:

At this rate we're not going to be there till midnight.
at any rate

used before saying one fact that is certain in a situation that you are generally not certain about:

Well, at any rate we need her to be there.
first-/second-/third-rate

very good, bad, or very bad:

→ See also birth rate , exchange rate

(Definition of “rate noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)