tr.v., -longed, -long·ing, -longs.
- To lengthen in duration; protract.
- To lengthen in extent.
[Middle English prolongen, from Old French prolonguer, from Late Latin prōlongāre : Latin prō-, forth; see pro-1 + Latin longus, long.]
prolonger pro·long'er n.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
