adverb

diametrically

diametrically

Their views are diametrically opposed.

Their views are diametrically opposed.

This is diametrically different from our plan.

This is diametrically different from our plan.

((diametrically)) + adjective Their views are diametrically opposed.

Synonyms: completely, totally, absolutely, directly; Antonyms: slightly, somewhat

From 'diameter'. It refers to being at opposite ends of a diameter, hence completely opposite.

Picture a circle. Two points on opposite ends of the 'diameter' are as far apart as possible. That's 'diametrically' opposed.

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