n. , informal A large number or amount; very many or very much; lots. I learned a lot in Mr. Smith's class. A lot of our friends are going to the beach this summer. Often used like an adverb. Ella is a jolly girl; she laughs a lot. Grandfather was very sick last week, but he's a lot better now. You'll have to study a lot harder if you want to pass. Also used as an adjective with "more", "less", and "fewer". There was a good crowd at the game today, but a lot more will come next week. Often used with "whole" for emphasis. John has a whole lot of marbles. Jerry is a whole lot taller than he was a year ago.
Compare: GOOD DEAL, GOOD MANY, A NUMBER.
Antonym: A FEW, A LITTLE.