"relevant principle" is correct and usable in written English.
You can use it to refer to an idea, rule, or assumption that applies to a particular situation or problem. For example, "The relevant principle here is that the data must be collected in a responsible way."
The relevant principle at work in the world of software might be called Netflix's Law.
We focus on law L as the relevant principle of association for purposes of brevity, acknowledging that some public reason liberals work with other principles of association.
But, since the relevant principle used to undercut haecceitism is not, strictly speaking, PII regarding objects or worlds but instead possibilities, it is unclear whether it merely collapses into the straightforward denial of haecceitism.
Interestingly, even after instruction on evolution, 19 out of 124 students wrote explanations of the evolutionary process (for the Dino Problem) that did not include any relevant principle of evolution by natural selection.
The key step in this second prong of the convergence argument is the claim that "when there is only one relevant principle that everyone could rationally choose, no one's objection to this principle could be as strong as the strongest objection to every alternative" (Parfit 2011, volume 2, p. 245).
Against such an account, the contractualist argues that the moral importance of promoting well-being is always mediated via its effect on the justifiability of the relevant principle: if an action fails to show sufficient concern for someone's well-being then that person has strong grounds for objecting to the principle.
The E.U. treaty already contains two relevant principles.
He should have a fair trial under an elected government applying the relevant principles of Iraqi and international law.
Relevant principles extracted from experts are not sufficiently detailed to generate a solution.
It may also be that human beings are genetically endowed with rather more specific and linguistically relevant principles of categorization.
If the compromis fails in some particular (e.g., to define the applicable law), the arbitrator generally applies the relevant principles of international law.
