Witnessing or evangelism, a name for proselytising in Christianity
Jehovah's Witnesses, a restorationist Christian denomination whose name references the above
Other uses
Witness (mathematics), a value τ for variable x with the property that φ(τ) is true, rendering the existential statement ∃x φ(x) true as well; τ is then said to be a witness for the statement ∃x φ(x)
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