S: (n) parity ((mathematics) a relation between a pair of integers: if both integers are odd or both are even they have the same parity; if one is odd and the other is even they have different parity) "parity is often used to check the integrity of transmitted data"
S: (n) transitivity ((logic and mathematics) a relation between three elements such that if it holds between the first and second and it also holds between the second and third it must necessarily hold between the first and third)