To a great extent or degree.
Expenses greatly exceeded revenues this year, much to nobody's surprise.
From Middle English gretly, gretely, gretliche, greteliche, equivalent to great + -ly.
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Nobly; magnanimously.
His Suff’rings ſhine, and ſpread a Glory round him; Greatly unfortunate, he fights the Cauſe Of Honour, Virtue, Liberty, and Rome.