live·long I. \ˈlivˌ ̷ ̷, ˈlīv-\adjective Etymology: Middle English lef long, from lef dear + long — more at lief, long : whole, entire, complete — usually used of a period of time < the livelong day he sat in his loom, his ear filled with its monotony — George Eliot > II. \ˈlivˌ ̷ ̷\noun (-s) Etymology:live (I) + long (adverb) 1.: orpine 2.: pearly everlasting