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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.
long-standing is an adjective meaning "having existed for a long time". It carries one recorded sense.
having existed for a long time
“a long-standing friendship”
“the longstanding conflict”
Definitions, synonyms and semantic relations for long-standing come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.