Etymology
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roughly (adv.)

c. 1300, roughlie, "ungently, violently," from rough (adj.) + -ly (2). Hence "without much care or skill, in a rude or imperfect way," c. 1600; the meaning "approximately, without precision or exactness" is from 1841.

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Definitions of roughly

roughly (adv.)
(of quantities) imprecise but fairly close to correct;
roughly $3,000
Synonyms: approximately / about / close to / just about / some / more or less / around / or so
roughly (adv.)
with roughness or violence (`rough' is an informal variant for `roughly');
he was pushed roughly aside
Synonyms: rough
roughly (adv.)
with rough motion as over a rough surface;
Synonyms: rough
From wordnet.princeton.edu