# a great deal

idiom

Source: https://englishreference.com/idiom/a-great-deal
Updated: 2026-08-10

## Meaning

Very much; to a great extent; a lot; lots.

## Examples

- I learned a great deal from this book.
- She spent a great deal of time preparing for the interview to ensure she was ready for every question.
- The scientist invested a great deal of effort into her research, hoping that her findings would eventually lead to a breakthrough in the field.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.