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Entry 2 senses Webster, 1913

Livelong

· Live·long · IPA
01 a. Whole; entire; long in passing; -- used of time, as day or night, in adverbial phrases, and usually with a sense of tediousness.
  1. 1.
    Whole; entire; long in passing; -- used of time, as day or night, in adverbial phrases, and usually with a sense of tediousness.
    “The obscure bird Clamored the livelong night.” Shak.
    “How could she sit the livelong day, Yet never ask us once to play?” Swift.
  2. 2.
    Lasting; durable.[Obs.]
    “Thou hast built thyself a livelong monument.” Milton.