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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
km/h is a noun meaning "the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)". It carries one recorded sense.
the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)
Canada · United Kingdom
Definitions, synonyms and semantic relations for km/h come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.