last word

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

• noun The final statement in a verbal argument.
• noun A conclusive or authoritative statement or treatment.
• noun Power or authority of ultimate decision.
• noun Informal The newest or most fashionable example of its kind; the latest thing.

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

• noun idiomatic, often preceded by "the" and followed by "in" The finest, highest, or ultimate representative of some class of objects.
• noun idiomatic Concluding remarks or comments
• noun plural the final statement uttered by a person before death.
• noun idiomatic A final decision, or the right to make such a decision.

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

• noun the final statement in a verbal argument
• noun an authoritative statement
• noun elegance by virtue of being fashionable