"a certain guarantee" is correct and usable in written English.
It can be used when referring to a specific assurance or promise that is not precisely defined but is understood in context.
Example: "The company offers a certain guarantee that their products will meet quality standards."
Alternatives: "a specific assurance" or "a particular promise".
The economics of selling to the entire globe, with US domestic no longer a certain guarantee of profitability for such large budget, made it a necessity.
Declaration in assumpsit, stating that defendant promised, in consideration that plaintiffs, at his request, would give up to him a certain guarantee of £10,000 on behalf of L., then held by plaintiffs.
But the obsession runs deeper in areas like Hornstull where the hipster vibe common in New York's trendiest borough permeates the cultural scene and any mention of the word "Brooklyn" brings a certain guarantee of cool.
Uniform reporting gives a certain guarantee of quality.
To sum up, this is a tool that provides a certain guarantee that the strategy development process is informed, meets the needs and is complete [ 15].
The partial surveys so far carried out indicate the excellent capacity of this genus for natural regeneration, with trees of every age being found, ranging from recently germinated seedlings to adult trees, which gives a certain guarantee of the potential for permanent management.
If the river is failing to carry a certain, guaranteed volume of water to Lee's Ferry, which is just below Lake Powell, the river's lower-basin states (Nevada, Arizona and California) can legally force the upper-basin states (Colorado, Wyoming, New Mexico and Utah) to reduce or stop their water withdrawals.
"This requires a certain guaranteed amount of funding".
Mr Neoh's company asks local businesses to offer discounts, sometimes up to 90%, in return for a certain guaranteed number of customers.
While network monitoring might require very high accuracy (e.g., voltage levels must remain in a narrow band), for settlement and profiling, customer privacy can be even enhanced by adding differential privacy in order to prevent the detection of the presence of a single household in the aggregate, while at the same time providing a certain guaranteed ε-differential privacy level.
A source close to the council told Reuters he had heard that "one formula being proposed by the other side would see Gaddafi hand power to the head of parliament and leave the country with a certain guaranteed sum of money".
