1570: March (Month) Apr 2, 2019
In Latin, it is a common occurance to see a [t] be substituted for an [s] in or vice versa in certain environments. This is how the English words 'admit' and '(ad)mission' are from the same root but look different, because the verb from which they both derive, 'mittere' ('to send') appeared as 'missus' ('sending') as a participle. Considering the month of March, this can be seen as well, as the month is named for the Roman god Mars, but the name for the month in Latin is 'Martius'.
Support Word Facts on Patreon.com/wordfacts
Support Word Facts on Patreon.com/wordfacts