Definition of lah noun from the Oxford Advanced Learner's Dictionary

 

lah

 noun
(also la)noun
BrE BrE//lɑː//
 
; NAmE NAmE//lɑː//
 
(music)
 
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the 6th note of a major scale Word Origin Middle English: representing (as an arbitrary name for the note) the first syllable of Latin labii, taken from a Latin hymn.