 Similarly, words such as "criteria" and "phenomena" are used as singular by some speakers, although this is still considered incorrect in standard usage (see below).Scientific abbreviations for words of Latin origin ending in "-a", such as "SN" for "supernova", can form a plural by adding "-e", as "SNe" for "supernovae".Some people treat "process" as if it belonged to this class, pronouncing "processes" instead of standard .