"Stadium" comes from the Greek word "stadion" (στάδιον), a measure of length equalling the length of 600 human feet. As feet are of variable length the exact length of a stadion depends on the exact length adopted for 1 foot at a given place and time. Although in modern terms 1 stadion = 600 ft (180 m), in a given historical context it may actually signify a length up to 15% larger or smaller.[3]

A Roman stadium was defined somewhat differently to be a distance of 125 passus (double-paces), equal to about 185 m (607 ft).

Although most dictionaries provide for both "stadiums" and "stadia" as valid plurals, etymological sticklers sometimes apply "stadia" only to measures of length in excess of 1 stadium.

So he should intentionally use a word incorrectly because you might have a problem with it?

No, he should use the preferred American English form rather than acting like a pompous fucking douchebag.

No, he should use the preferred American English form rather than acting like a pompous fucking douchebag.

But he is a pompous fucking douchebag.

No, he should use the preferred American English form rather than acting like a pompous fucking douchebag.

I wonder if he says "musea" or "octopodes."