"conditions were met" is a correct and usable phrase in written English. You can use it to describe a situation where a set of requirements or demands were satisfied. For example, "The negotiations were successful when both sides agreed that the conditions were met.".
Sanctions would not end until all conditions were met.
"All the conditions were met at the time.
None of these conditions were met in Cornwall".
The groups agreed to stop fighting if those conditions were met, Mr. Abedi said.
Carter split the difference in opposing a coup unless certain conditions were met.
He told Soering's associates that he'd sign off only if additional conditions were met.
If these conditions were met, the court ruled, same-sex harassment was indeed actionable.
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MA of Applied Linguistic, Maquarie University, Australia