adverb
1. : to a considerable degree or extent : by a considerable amount
a great deal better
2. : often , frequently
he runs a great deal
— used with intransitive verbs
3. : highly
think a great deal of that book
adverb
1. : to a considerable degree or extent : by a considerable amount
a great deal better
2. : often , frequently
he runs a great deal
— used with intransitive verbs
3. : highly
think a great deal of that book
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012