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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

group, grouping go
any number of entities (members) considered as a unit

arrangement go
an orderly grouping (of things or persons) considered as a unit

array go
an orderly arrangement

matrix go
(mathematics) a rectangular array of quantities or expressions set out by rows and columns

square matrix go
a matrix with the same number of rows and columns

diagonal matrix go
a square matrix with all elements not on the main diagonal equal to zero

scalar matrix go
a diagonal matrix in which all of the diagonal elements are equal

identity matrix, unit matrix
a scalar matrix in which all of the diagonal elements are unity

noun.group

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