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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"
n.
(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"
n.
an attitude of mind especially one that favors one alternative over others; "he had an inclination to give up too easily"; "a tendency to be too strict"