S. Worthen | Weblog

As I was glancing through Profit magazing today, I ran across the phrase modus operandum. Someone knew enough Latin to know that the -i ending in modus operandi might be a plural, and they only wanted a singular instance, and so must have corrected accordingly. In this case, however, the -i ending makes it a genitive (or possessive for those not up on the terminology), and it was quite correct was it likely was before it made it to print.