Simple past tense and past participle of occur. (verb)
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Use "occurred" in a sentence
"However, to counter the argument that despite being generic, Facebook, Inc. 's use of the mark could be described as "famous" (a legal technical term) -- which did arise as I expected -- I also made the factual claim that my use of the term occurred prior to Mark's."
"Another word occurred to her, but it would have been disloyal to Holland to mention it."
"The change of the title occurred because of some negative feedback that had MBT's publishers desirous for an alternative handle."