the GNU version of the Collaborative International Dictionary of English
n. One who, or that which, quickens.
The Century Dictionary and Cyclopedia
n. One who or that which quickens, revives, vivifies, or communicates life; that which reinvig-orates; something that accelerates motion or increases activity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an agent that gives or restores life or vigor
Word Usage
"—The Decemberists Helpful tempo quickener—short but sweet."