Simple past tense and past participle of intervene.(verb)
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Use "intervened" in a sentence
"Incidentally, this piece is later than usual because heavy politics intervened from the beginning of the week on and this show airs late on Sunday night."
"Washington's Chasity Melvin intervened to keep the scene from getting uglier."
"Then fortune again intervened for they obtained their results in the midst of a great war when ordinary economics are in abeyance and large scale production could go ahead as it would never have done in times of peace."