Etymology
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livelong (adj.)

also live-long, of a period of time, "long, whole" c. 1400, lefe longe (day or night), from leve, lief "dear" (see lief), used here as an emotional intensive + long (adj.). From late 16c. conformed in spelling and pronunciation to live (v.) as lief grew strange. German has cognate die liebe lange (Nacht), etc., literally "the dear long (night)."

updated on August 07, 2016

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Definitions of livelong from WordNet
1
livelong (n.)
perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers;
Synonyms: orpine / orpin / live-forever / Sedum telephium
2
livelong (adj.)
(of time) constituting the full extent or duration;
all the livelong day
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.