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diametrical

or di·a·met·ric

[dahy-uh-me-tri-kuh l or dahy-uh-me-trik]
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adjective
  1. of, relating to, or along a diameter.
  2. in direct opposition; being at opposite extremes; complete: diametrical opposites; a diametrical difference.
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Origin of diametrical

1545–55; < Greek diametrik(ós) (diámetr(os) diameter + -ikos -ic) + -al1
Related formsdi·a·met·ri·cal·ly, adverbun·di·a·met·ric, adjectiveun·di·a·met·ri·cal, adjectiveun·di·a·met·ri·cal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for diametrically

diametrically

adverb
  1. completely; utterly (esp in the phrase diametrically opposed)
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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

Word Origin and History for diametrically

adv.

1630s, "completely" (opposed, contrary, etc.); see diametric. Mostly in figurative use; the two points that mark the ends of a line of diameter across a circle are opposite one another.

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Online Etymology Dictionary, © 2010 Douglas Harper