Etymology
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doubly (adv.)

"in a double or twofold manner, in two different ways, as a pair," c. 1400, from double (adj.) + -ly (2).

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Definitions of doubly

doubly (adv.)
to double the degree;
she was doubly rewarded
Synonyms: double / twice
doubly (adv.)
in a twofold manner;
he was doubly wrong
Synonyms: in two ways
From wordnet.princeton.edu