separation

[OED]: 6. The place where two or more objects separate or are divided from one another; a parting, line of division.

separation

in
Source: 
Piaget and Inhelder (1967)
a spatial relation correspond(ing) to a very primitive function; one involved in the segregation of units, or in a general way, the analysis of elements making up a global or syncretic whole (p 7)
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