time-tested

[tahym-tes-tid]
adjective
having proved valid, workable, or useful over a long span of time: a time-tested theory.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
time-tested

adjective
tested and proved to be reliable [syn: tested
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Read our feature to get their time-tested tips from our panel discussion.
It denotes a technical object that is immediately at hand, yet too complicated
  to summarize with some better, time-tested noun.
One time-tested but expensive way to produce drinking water is desalination:
  removing dissolved salts from sea and brackish water.
There are many time-tested universal health care systems to choose from.
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