life ‧ long /ˈlaɪflɒŋ $ -lɒːŋ/ BrE AmE adjective [only before noun]
[ Word Family: noun : ↑ life , ↑ lifelessness , ↑ lifer ; adjective : ↑ lifeless , ↑ lifelike , ↑ lifelong ; adverb : ↑ lifelessly ]
continuing or existing all through your life:
She became a lifelong friend of ours.
David finally realized his lifelong ambition.