1. the fact or quality of being similar and able to be compared:"there are differences in hospital recording practices that will affect the comparability of results"
Mathematical relation with respect to a partial order
In mathematics, two elements x and y of a set P are said to be comparable with respect to a binary relation ≤ if at least one of x ≤ y or y ≤ x is true. They are called incomparable if they are not comparable. Wikipedia