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diametrically (adv.)

1630s, "completely, in an extreme degree" (with opposed, contrary, etc.), from diametrical (see diametric + -al (1)) + -ly (2). Originally and mostly in figurative use: the two points that mark the ends of a line of diameter are opposite one another. Diametrical opposition translates Aristotle's phrase for "extreme opposition."

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Definitions of diametrically from WordNet

diametrically (adv.)
as from opposite ends of a diameter;
three of these brushes were approximately 120 feet apart and the fourth diametrically opposite to one of the three
when two honest witnesses give accounts of the same event that differ diametrically, how can anyone prove that the evidence you gave was deliberately false?
From wordnet.princeton.edu