I've come into a situation where I need to use the plural form of corpus, but I'm a bit confused about which plural form to use.
Linguistics . a body of utterances, as words or sentences, assumed to be representative of and used for lexical, grammatical, or other linguistic analysis.
In this sense, it's corpuses.
In my specific situation, I have a collection of data—to be processed—about a class of objects that can be swapped out at will (thus the reference to more than one corpus). To me, this satisfies the first sense of the word ("a large or complete collection of writings")—where the plural is corpora—as well as the linguistic sense of the word—where the plural is corpuses.
So what's the significant difference between these two senses of the word? When is corpora correct, and when is corpuses correct?