noun.
An amount or rate of decrease in time taken.
noun.
The relationship between time taken and number of processors used.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the act of accelerating; increasing the speed
Word Usage
"Has it dawned on Friedman that this kind of speedup, which is reflected in so many aspects of modern life including the stock market, may be a source of our deeper woes?"