Longstanding in a Sentence 

Definition of Longstanding  

enduring or well-established

Examples of Longstanding in a sentence

The longstanding war of the Crusades began in 1095 A.D. and ended almost two hundred years later in 1291 A.D.  
The longstanding feud between the two neighbors had been going on so long that neither of them could remember why it started.  
Our longstanding tradition for my entire family is to go camping during the first week of July in the Smoky Mountains which we have done for at least fifty years.  

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