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Classic usage
Reading level: hard
Estimated CEFR level: B1 — Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English confirmen, confermen, from Old French confermer, from Latin cōnfirmāre (“to make firm, strengthen, establish”), from con- (“together”) + firmāre (“to make firm”), from firmus (“firm”).
corroborate, sustain, substantiate, support, affirm
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tap / space
Classic usage
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