longstanding

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

Origin of longstanding

1
First recorded in 1595–1605; long1 + standing

Other words for longstanding

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How to use longstanding in a sentence

British Dictionary definitions for long-standing

long-standing

adjective
  1. existing or in effect for a long time

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