v. Simple past tense and past participle of intensify.
the GNU version of the Collaborative International Dictionary of English
adj. made more severe or intense, especially in law.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. made more intense
Word Usage
"How much this added to the growing tension between Marx and Hess is not clear, but as the search for a definition intensified, Hess was being driven further and further away from Marx by Engels."