say it: dahy-uh-MEH-tri-kuh-lee
diametrically is an adverb meaning "as from opposite ends of a diameter". It carries one recorded sense.
as from opposite ends of a diameter
“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?”
“three of these brushes were approximately 120 feet apart and the fourth diametrically opposite to one of the three”
Definitions, synonyms and semantic relations for diametrically come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. .