Monday is a noun and defined as the second day of the week. First used before the 12th century, Monday is one of the many words in the English language that has its roots in Norse mythology.
Interestingly, the days of the week in the English language derive from Norse mythology, unlike the days of the week in the Romance Languages, which derive from Roman mythology. This divergence is often referred to as interpretatio germanica and describes how the Germanic peoples identified and adapted Roman gods with the names of Germanic deities. According to historians, this transition occurred when both cultures came into contact around the 1st century AD.
Monday derives from the Nordic word Mani, which means moon. In the Romance languages, the second day of the week also derives from the Latin word for moon Luna, and in Italian and Spanish the word for the second day of the week is lunedi and lunes, respectively.
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Sources
Viking Ship Museum in Roskilde
“Monday.” Merriam-Webster.com Dictionary
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