life·long

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

Origin:
1750–60; life + long1 (adv.)

lifelong, livelong.
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Collins
World English Dictionary
lifelong (ˈlaɪfˌlɒŋ) [Click for IPA pronunciation guide]
 
adj
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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00:10
Lifelong is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

lifelong
"continuing a lifetime," 1855, from life + long (adj.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Ideally, a malaria vaccine would provide lifelong protection.
She often spoke of her lifelong craving for affection and her need to give it.
They recognize one another and develop lifelong cooperative relationships.
However, because the implant is prone to infection and other complications,
  patients must take a lifelong course of antibiotics.
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