adjective Physics, Mathematics.
a scalar quantity that changes sign when the sense of the orientation of the coordinate system is changed.

1940–45; pseudo- + scalar Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pseudoscalar (ˌsjuːdəʊˈskeɪlə)
maths pseudovector scalar tensor Compare vector a variable quantity that has magnitude but not direction and is an odd function of the coordinates

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The full lowest-lying pseudoscalar and vector multiplets are included in the program.
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