livelong

UK: /ˈlɪvˌlɒŋ/ US: /ˈlɪvˌlɔŋ, -ˌlɑŋ/ ,(liv′lông′, -long′)

WordReference Random House Learner's Dictionary of American English © 2025

live•long /ˈlɪvˌlɔŋ, -ˌlɑŋ/   adj. 

1. (of time) whole;
   entire:
   to complain the livelong day.

WordReference Random House Unabridged Dictionary of American English © 2025

live•long  (liv′lông′, -long′), adj. 

1. (of time) whole or entire, esp. when tediously long, slow in passing, etc.:
   We picked apples the livelong day.

• alteration (by association with live¹) of earlier leeve long, Middle English leve longe dear long. See lief, long¹ 1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

livelong / ˈlɪvˌlɒŋ/ adjective

1. (of time) long or seemingly long, esp in a tedious way (esp in the phrase all the livelong day)
2. whole; entire

noun

1. 
   another name for orpine