[lawng-stan-ding, long-]
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Origin of longstanding

First recorded in 1595–1605; long1 + standing

Synonyms for longstanding

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for longstanding

also long-standing, c.1600 (n.), 1814 (adj.), from long (adj.) + standing.

Online Etymology Dictionary, © 2010 Douglas Harper