By a notably large amount or to a notably large extent; greatly,
By a notably large amount or to a notably large extent; greatly
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things have improved considerably over the last few years
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a considerably higher density
Web Definitions:
well: to a great extent or degree; "I'm afraid the film was well over budget"; "painting the room white made it seem considerably (or substantially) larger"; "the house has fallen considerably in value"; "the price went up substantially"
(considerable) large or relatively large in number or amount or extent or degree; "a considerable quantity"; "the economy was a considerable issue in the campaign"; "went to considerable trouble for us"; "spent a considerable amount of time on the problem"