The phrase "as a certain relation" is correct and usable in written English.
It can be used when discussing a specific type of relationship or connection in a particular context.
Example: "In the context of mathematics, we can define a function as a certain relation between a set of inputs and outputs."
Alternatives: "as a specific relationship" or "as a particular connection".
As shown in Fig. 9, GNSS PWV errors show a certain relation with estimated antenna altitude.
On such theories, events are construed as sets of functions from spatiotemporal locations to "situation types" defined as sequences of objects standing or failing to stand in a certain relation.
Each stone encapsulates a certain relation of landscape, building, machine, power and nature.
However, Russell himself warned against interpreting his position on relations this way, writing, "the doctrine that relations are 'external' … is not correctly expressed by saying that two terms which have a certain relation might not have had that relation.
(This would be a natural consequence of Weyl's definition of a function as a certain kind of relation).
Technics exists within a certain mode of production as well as in certain relations of production.
Just as deductive logic consists of the study of a certain consequence relation between propositions or sets of propositions (the relation of valid implication), so defeasible (or nonmonotonic) logic consists of the study of a different kind of consequence relation.
One may invoke a theory — a theory of temporal parts, for example — that construes the relation as a certain kind of similarity, but that is theory, not pretheoretical intuition.
Structural realism is another view promoting selectivity, but in this case it is the natures of unobservable entities that are viewed sceptically, with realism reserved for the structure of the unobservable realm, as represented by certain relations described by our best theories.
