Webster's English Dictionary

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la

1. la \'la:\ n [ME, fr. ML, fr. the syllable sung to this note in a 
   medieval hymn to St. John]the Baptist : the sixth tone of the diatonic 
   scale in solmization 
2. la \'lo., 'la:\ ij [ME (northern dial.), fr. OE la-] chiefly dial  : - 
   used for emphasis or expressing surprise