The phrase "a specific assurance" is correct and usable in written English.
You can use it when referring to a particular guarantee or promise made regarding a situation or outcome.
Example: "The company provided a specific assurance that the product would be delivered on time."
Alternatives: "a particular guarantee" or "a definite promise."
Overall, most patients trusted that their care team would carry out the checklist correctly: less than a third (29%) were worried that staff would not complete it correctly, and most (63%) did not want any specific assurance of it having been used, or were impartial.
I would have preferred a more specific assurance that government retrenchment will not come at the expense of the poor and vulnerable.
Mr. Hu did not offer any specific assurances to Mr. Obama, the official said, but he also did not complain about joint American-South Korean military exercises in the Yellow Sea.
Clark's 2016 letter did not make any specific assurances about the UK's future Brexit policy, although it did seek to provide general comfort to Ghosn and acknowledged his concern about the impact of changes in the terms of trade.
"He assured me, he gave me specific assurance [there was] no unprofessional behaviour, he was satisfied with that.
Critics now say the Obama administration was outmaneuvered by North Korean negotiators and should have gotten a specific written assurance that satellite launches were covered.
The physicist mission is to ensure that every new technology, as RTA, is deployed with highest safety by technical validation and by implementing a specific quality assurance program.
BBC Trust chair Rona Fairhead has said BBC director general Tony Hall gave her "specific assurance" about bullying at the corporation following claims that former Top Gear presenter Chris Evans was "out of control".
The results suggest that purchasing professionals are more likely to recommend use of the exchange when general assurance over the reliability of the exchange's system is present than when specific assurance over the reliability of transaction information is present.
In a meeting Tuesday, Obama offered no specific assurances to liberal leaders about what a final deal might look like and what entitlement programs might face cuts.
