la

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The sixth tone of the diatonic scale in solfeggio.
• interjection Used to express emphasis or indicate surprise.

from The Century Dictionary.

• noun In solmization, the syllable used for the sixth tone of the scale—that is, the submediant.
• noun The feminine form of the definite article in French, occurring in some names and phrases used in English.
• An expression of mild admiration, wonder, or surprise, and formerly of asseveration: as, O la! that is strange.
• noun A contraction of Louisiana.
• noun In chem., the symbol for lanthanum.

from the GNU version of the Collaborative International Dictionary of English.

• interjection obsolete Look; see; behold; -- sometimes followed by you.
• interjection Low An exclamation of surprise; -- commonly followed by me
• noun A syllable applied to the sixth tone of the scale in music in solmization.
• noun The tone A; -- so called among the French and Italians.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Prefixed to the name of a woman, with ironic effect (as though an opera prima donna).
• interjection obsolete Used to introduce a statement with emphatic or intensive effect.
• interjection archaic Expressing surprise, anger etc.
• noun music A syllable used in solfège to represent the sixth note of a major scale.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a state in southern United States on the Gulf of Mexico; one of the Confederate states during the American Civil War
• noun a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
• noun the syllable naming the sixth (submediant) note of a major or minor scale in solmization