Definitions of la:

• noun:   the syllable naming the sixth (submediant) note of a major or minor scale in solmization
• noun:   a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
• noun:   a state in southern United States on the Gulf of Mexico; one of the Confederate states during the American Civil War
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #12802)