Simple past tense and past participle of witness.(verb)
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Use "witnessed" in a sentence
"If memory serves correct, this horrific act I witnessed from the top of my apt. building nine years ago was committed, admittedly by Al Qaeda, on the basis of "jihad" or "holy WAR" and was an attack on our sovereign land."
"Plus, what I have witnessed is a consistent tendancy to define R&C and negotiated rates on the current medicaid accepted rates which are AT MOST 10% of the lowest cost for a specific service by a provider."
"[ "Moon bombing"] may also trigger conflict with known extraterrestrial civilizations on the moon as reported on the moon in witnessed statements by U.S. astronauts Buzz Aldrin and Neil Armstrong, and in witnessed statements to NSA (National Security Agency) photos and documents regarding an extraterrestrial base on the dark side of the moon."