symmetric ( synonym found)
Definition of symmetric:

(adj) : Symmetrical; of a relation R on a set S, such that xRy if and only if yRx for all members x and y of S (that is, if the relation holds between any element and a second, it also holds between the second and the first)
"Is a sibling of" is a symmetric relation.
Definition of symmetric:

(adj) : Symmetrical; of a relation R on a set S, such that xRy if and only if yRx for all members x and y of S (that is, if the relation holds between any element and a second, it also holds between the second and the first)
"Is a sibling of" is a symmetric relation.
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