[lawng-tahym, long-]
existing, occurring, or continuing for a long period of time; longstanding: longtime friends celebrating 50 years of association.

1575–85; long1 + time

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World English Dictionary
longtime (ˈlɒŋˌtaɪm)
of long standing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

also long-time, 1580s, from long (adj.) + time.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Researchers say this longtime bane of offshore drilling is more cost-efficient
  than wind and solar.
The shifts have made some longtime residents uneasy.
Longtime rap fans are doing the math and coming to the same conclusions as the
  music's voluminous critics.
Longtime lurker, occasional past poster, registered with a new moniker.
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