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Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
From Middle English unde (“a wave”), from either the Old French unde or Latin unda (“wave”). Doublet of water, ultimately from the same Indo-European root.
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Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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