the GNU version of the Collaborative International Dictionary of English
n. The act of lengthening in space or in time; extension; protraction.
n. That which forms an additional length.
The Century Dictionary and Cyclopedia
n. The act of prolonging, or lengthening in time or space: as, the prolongation of a line.
n. A part prolonged; an extension: as, the prolongation of a mountain-range.
n. Extension of time by delay or postponement.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. amount or degree or range to which something extends
n. the act of prolonging something
n. the consequence of being lengthened in duration
Word Usage
"This results in prolongation of half-life from 0.8 hours in healthy subjects to 1.3 hours in patients with moderate hepatic impairment and 2.4 hours in severely impaired patients."