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longstanding

[lawng-stan-ding, long-]
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adjective
  1. existing or occurring for a long time: a longstanding feud.
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Origin of longstanding

First recorded in 1595–1605; long1 + standing

Synonyms

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enduring, lasting, long-lasting.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for long-standing

long-standing

adjective
  1. existing or in effect for a long time
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for long-standing

longstanding

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

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Online Etymology Dictionary, © 2010 Douglas Harper