[lahyf-lawng, -long]
lasting or continuing through all or much of one's life: lifelong regret.

1750–60; life + long1 (adv.)

lifelong, livelong. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lifelong (ˈlaɪfˌlɒŋ)
lasting for or as if for a lifetime

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"continuing a lifetime," 1855, from life + long (adj.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's not that such a moment, one that transforms an afternoon walk into a
  lifelong memory, couldn't happen in another town.
They recognize one another and develop lifelong cooperative relationships.
At last, his lifelong dream of a career creating large-scale extravaganzas for
  princely dwellings was coming true.
It was part of a lifelong pattern of setting and fulfilling astronomical
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