The phrase "a system that defines" is correct and usable in written English.
You can use it when describing a system that establishes or outlines specific parameters, rules, or characteristics.
Example: "The software operates within a system that defines user permissions and access levels."
Alternatives: "a framework that specifies" or "a structure that outlines".
The e-mailers are exasperated with the filters and want a system that defines their e-mail as legitimate and guarantees its delivery.
The origins of Texas water law, which contains elements of the state's Spanish, English, and Republic heritages, contributed to the development of a system that defines water by where it sits, flows, or falls and assigns its ownership accordingly.
In nuclear fusion research, the Lawson criterion, first derived by John D. Lawson in 1957, is an important general measure of a system that defines the conditions needed for a fusion reactor to reach ignition stage, that is, the heating of the plasma by the products of the fusion reactions is sufficient to maintain the temperature of the plasma against all losses without external power input.
Egypt's security forces have cracked down hard on voices of opposition in the eight months since the July 3 coup, while critics accuse the government of increasingly resuming the posture and opacity of military authoritarianism — a system that defined this country's government for decades until Mubarak's overthrow in 2011.
What if I had been free to be myself from the beginning rather than having to "earn" it through a system that defined my success with an acceptance letter and my self-worth with a trophy?
Beginning nearly a century later, as the rule of the Qing Empire expanded over wider groups of people, writers and gazetteers recast their descriptions away from reflecting degree of acculturation, and toward a system that defined the aborigines relative to their submission or hostility to Qing rule.
L-system is a rewriting system that defines a complex object by replacing parts of the initial object according to rewriting rules, which can simulate development rules and topological structure.
L-system is a rewriting system that defines a complex object by replacing parts of the initial object according to rewriting rules, and it simulates development rules and topological structure well (Lindenmayer 1968; Han 2007).
It is essentially a ramp system that defines how one encounters BBBoC as one takes on a journey through the building.
Realistic Simulation - Give your creations personalities with a robust system that defines their every action.
The AV world uses a level system that defines its state of autonomy (level 5 being completely autonomous).
