prolongate
American Heritage Dictionary:
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pro·lon·gate
(prə-lông'gāt', -lŏng'-, prō-) 
tr.v., -gat·ed, -gat·ing, -gates.
To prolong.
prolongation pro'lon·ga'tion (prō'lông-gā'shən, -lŏng-) n.
tr.v., -gat·ed, -gat·ing, -gates.
To prolong.
prolongation pro'lon·ga'tion (prō'lông-gā'shən, -lŏng-) n.
Roget's Thesaurus:
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prolongate
verb
- To make or become longer: draw out, elongate, extend, lengthen, prolong, protract, spin (out), stretch (out). Mathematics produce. See increase/decrease, long/short.
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American Heritage Dictionary
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.
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