Q. The plural of “curriculum” is “curricula.” Why does the dictionary list “symposiums” as an acceptable plural for “symposium”? And does the rule differ for every plural of words ending in -um?

A. “Curricula” is the plural in Latin. In American English, the plural is “curriculums.” Both are correct, although in academic writing, there is a tradition of using the Latin plurals. Chicago editors follow Webster’s 11th Collegiate when forming plurals of adopted words, but please see CMOS 7.6.