la

From Glover's solmization, from Middle English la (“sixth degree or note of Guido of Arezzo's hexachordal scales”), Italian la in the solmization of Guido of Arezzo, from the first syllable of Latin labiī (“lip's”) in the lyrics of the scale-ascending hymn Ut queant laxis by Paulus Deacon.

Sound used to form meaningless song refrains. Of imitative origin. Compare Old English lā (a common exclamation), Ancient Greek λαλαγε (lalage, “babble”), German lallen (“to babble”).

From Middle English la, from Old English lā. More at lo.

From French la, Italian la.

Possibly a shortened form of lad.

Abbreviation.

From Cantonese 啦 (laa1). Doublet of lah.