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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Borrowed from translingual Orthosiphon, itself from Ancient Greek ὀρθός (orthós, “straight”) + Ancient Greek σῑ́φων (sī́phōn, “pipe, tube”).
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tap / space
Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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