verb.
Simple past tense and past participle of strengthen.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
given added strength or support
Word Usage
"He saw it first -- he was on the ground, and the place was his by right of discovery, the title strengthened by the fact that four of his ancestors had been Concord clergymen, and the most excellent and venerable Doctor"