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antiparallel

[an-tee-par-uh-lel, an-tahy-] /ˌæn tiˈpær əˌlɛl, ˌæn taɪ-/
adjective, Mathematics, Physics.
1.
(of two vectors) pointing in opposite directions.
Origin
1650-1660
1650-60; anti- + parallel
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anti parallel

antiparallel

/ˌæntɪˈpærəˌlɛl/
adjective
1.
(physics) parallel but pointing in the opposite direction
2.
(maths) (of vectors) parallel but having opposite directions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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