American Heritage Dictionary
(1)
Century Dictionary
(3)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
While impossible to corroborate, there was definitely a sense among many that agent provocateurs and undercover police were playing some kind of role in stirring things up, effectively breaking up an otherwise peaceful - if unpermitted - march during George W. Bush's speech at the Xcel.— Politics in Minnesota - Minnesota's Public Affairs News Service
Suranjali: Just to corroborate, we need political security.— BBC News | News Front Page | World Edition
Moreover, because of its current lack of air-mobility and aerial reconnaissance capability, particularly helicopters, UNAMID was not able to independently corroborate or confirm the information received from various sources.— Database of Press Releases related to Africa

American Heritage Dictionary (1)
Century Dictionary (2)
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