Wordnet 3.0
ADVERB (1)
1.
as from opposite ends of a diameter;
- Example: "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?"- Example: "three of these brushes were approximately 120 feet apart and the fourth diametrically opposite to one of the three"
The Collaborative International Dictionary of English v.0.48:
Diametrically \Di*am"e*tric*al*ly\, adv.
In a diametrical manner; directly; as, diametrically
opposite.
[1913 Webster]
Whose principles were diametrically opposed to his.
--Macaulay.
[1913 Webster]
WordNet (r) 3.0 (2006):
diametrically
adv 1: 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"