partner relation
— Noun
– English
~ the responsibility of partners to act in one another's best interests
phylogenetic relation
— Noun
– English
~ (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts; "in anatomical structure prehistoric man shows close affinity with modern humans"
principle of relativity
— Noun
– English
~ (physics) a universal law that states that the laws of mechanics are not affected by a uniform rectilinear motion of the system of coordinates to which they are referred