Definition of last word
1
: the final remark in a verbal exchange
2a
: the power of final decision
b
: a definitive statement or treatment
this study will surely be the last word on the subject for many years
3
: the most advanced, up-to-date, or fashionable exemplar of its kind
the last word in sports cars
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Merriam-Webster unabridged
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The first known use of last word was in 1509
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