affinity

[OED]: 5. fig. Causal relationship or connexion (as flowing the one from the other, or having a common source), or such agreement or similarity of nature or character as might result from such relationship if it existed

affinity

in
Source: 
Piaget and Inhelder (1967)
Affinities (affinitive transformations) may be defined mathematically as projective correspondences (homologies) conserving parallelisms; similarities as affinities conserving angles; movements as similarities conserving distances (p 301).
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