dimensionality

CEFRB2

/daɪˌmɛn.ʃəˈnæl.ɪ.tɪ/

noun

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Sits at B2 on the CEFR scale

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Dimensionality reduction is a key technique.
As well as the low dimensionality of the Bloch electron states, […]
The difficulties in implementing classification algorithms as is, on high volume databases, derives from the increase in the number of records/instances in the database and of attributes/features in each instance (high dimensionality).

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This often happens, for example, when a two-dimensional solution is obtained for data whose appropriate dimensionality is higher.
1978, Joseph B. Kruskal, Myron Wish, Multidimensional Scaling, →ISBN, page 44
Finite Dimensionality of de Rham Cohomology: Proposition 5.3.1. If the manifold M has a finite good cover, then its cohomology is finite dimensional.
1982, Raoul Bott, Loring W. Tu, Differential Forms in Algebraic Topology, →ISBN, page 43
The programming language does not impose any restrictions on the dimensionality of the arrays.
2010, Basavaraj S. Anami, Shanmukhappa A. Angadi, Sunilkumar S. Manvi, Computer Concepts and C Programming, second, →ISBN, page 139

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From dimension + -ality.