Doubly

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wiktionary

ref

From Middle English dowbly, doubli, dubli, doubeliche, equivalent to double +‎ -ly. [1]


etymonline

ref

doubly (adv.)

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

取自“https://www.bigphysics.org/index.php?title=Doubly&oldid=32820”