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WORDNET DICTIONARY

Noun orthogonality has 2 senses

• orthogonality(n = noun.linkdef) orthogonal opposition, perpendicularity - the relation of opposition between things at right angles; Array
is a kind of opposition

• orthogonality(n = noun.attribute) Array - the quality of lying or intersecting at right angles; Array
is a kind of oblongness, rectangularity
Derived form adjective orthogonal₃

ROGET THESAURUS

orthogonality

Perpendicularity

N perpendicularity, orthogonality, verticality, orthogonal, perpendicular, rectangular, uncorrelated.

For further exploring for "orthogonality" in Webster Dictionary Online