Etymology
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solidly (adv.)

1610s, "firmly, securely," from solid (adj.) + -ly (2). Meaning "unanimously" is from 1865, American English.

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Definitions of solidly

solidly (adv.)
as an undiversified whole;
the unions voted solidly for Roosevelt
solidly (adv.)
with strength and soundness;
a solidly built house
From wordnet.princeton.edu