Definition of lah in English:

lah

Line breaks: lah
Pronunciation: /lɑː
 
/
(also la)

noun

Music
1(In tonic sol-fa) the sixth note of a major scale.
1.1The note A in the fixed-doh system.

Origin

Middle English: representing (as an arbitrary name for the note) the first syllable of Latin labii, taken from a Latin hymn (see solmization).

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Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude