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n.
a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
n.
a relation between things or events (as in the case of one causing the other or sharing features with it); "there was a connection between eating that pickle and having that nightmare"
n.
a close connection marked by community of interests or similarity in nature or character; "found a natural affinity with the immigrants"; "felt a deep kinship with the other students"; "anthropology's kinship with the humanities"