adjective
greater; -est
very large in size :very big
usually used before a noun
b - used in the names of animals that are larger than similar animals
very large in amount or extent
very strong
b - used for emphasis before a noun that describes someone
very important
very bad :very extreme or severe
better than good: such as
of the highest quality
very important and admired
very talented or successful
d informal :very enjoyable, favorable, etc. :excellent
always used before a noun :more distant in a family relationship by one generation
usually used in combination
a great one for
informal
If you are a great one for (doing) something, you do it often or enjoy doing it very much.
go great guns
go to great pains
great with child
old-fashioned + literary :pregnant
no great shakes
adverb
greater; -est
informal :very well
noun
plural greats
[count] :a very successful or admired person - usually plural
US