LA

I. ˈlȯ, ˈlä interjection

Etymology: Middle English (northern dialect), from Old English lā

Date: before 12th century

chiefly dialect — used for emphasis or expressing surprise

II. ˈlä noun

Etymology: Middle English, from Medieval Latin, from the syllable sung to this note in a medieval hymn to Saint John the Baptist

Date: 14th century

: the sixth tone of the diatonic scale in solmization