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

1595–1605; long1 + standing

enduring, lasting, long-lasting.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The new measurement technique may also help address many longstanding puzzles
  in plate tectonics.
Salving these longstanding wounds won't be easy, as mistrust and animosity have
  grown over the years.
The magma-depth discovery may settle a longstanding debate.
Such trade in animals is a longstanding practice that is technically illegal
  but quite loosely enforced.
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