Quick Answer
The vocabulary of days and months is rich with history drawn primarily from Latin and Old English, with surprising borrowings from Norse mythology and Roman religious customs. From 'Tuesday' tracing back to a Norse god of war to 'January' named after the Roman god Janus, these time-related words reveal how ancient cultures shaped how we measure and name our time.
Quick Facts
| Sub-Topic | Days and Months |
|---|---|
| Domain | Everyday Words |
| Source Languages | Latin, Old English, Norse, Greek |
| Number of Key Terms | 22 |
| Oldest Term | March (from Latin Martius, named for Mars, ca. 8th century BCE) |
| Most Surprising Origin | Saturday — from Saturn, a Roman god, yet it survived in English unlike other planetary days |
The Language of Days & Months: An Overview
The vocabulary of days and months in English is a fascinating blend of ancient languages and mythologies, reflecting centuries of cultural and religious development. Most of the days of the week derive from a fusion of Latin planetary names and Germanic/Norse gods, a process dating back to the early medieval period when Christianized Anglo-Saxons adapted Roman concepts to their own pantheon.
Similarly, the months’ names stem largely from the Roman calendar, which was heavily infused with names of gods, emperors, and numeric markers corresponding to their original positions in the year. The Roman calendar itself evolved over centuries before being widely adopted in medieval Europe and eventually influencing the modern Gregorian calendar.
Understanding these origins not only explains the etymology but also reveals the ways ancient societies viewed time, the cosmos, and their place within it.
The Days & Months Terms Explained: Root by Root
Each day of the week, in English, carries the imprint of a celestial body or deity. For example, Monday derives from the Old English ‘Mōnandæg,’ literally ‘Moon’s day.’ This reflects the ancient practice of linking days to celestial objects, a tradition with roots in Babylonian and Roman astrology.
Tuesday comes from ‘Tīwesdæg,’ named after Tiw or Tyr, a Norse god of war, paralleling the Roman god Mars, whose day is Tuesday in Romance languages (Mardi in French). Wednesday traces back to ‘Wōdnesdæg,’ honoring Odin (Woden), the chief deity in Norse mythology, while Thursday is Thor’s day (‘Þūnresdæg’), and Friday derives from Frigg, goddess of love.
Saturday is unique in English as it retains its direct Roman origin from ‘Saturni dies,’ the day dedicated to Saturn. Sunday, like Monday, is named after a celestial body — the Sun.
The months, in contrast, mostly preserve their Latin roots. January honors Janus, the two-faced god of beginnings and transitions, fitting for the year’s start. February comes from ‘Februa,’ a purification festival. March references Mars, the god of war, marking the traditional start of the Roman year. April possibly stems from ‘aperire,’ to open, indicating blossoming nature. May and June honor Maia and Juno respectively, goddesses connected with fertility and marriage.
July and August break this pattern, being named for Julius Caesar and Augustus Caesar, reflecting the calendar’s political evolution. The last months—September through December—retain their Latin ordinal roots, meaning seventh through tenth months, revealing an older calendar system before January and February were added.
Why These Words Are Built This Way
The construction of day and month names follows a system deeply rooted in astronomy, religion, and politics. Ancient peoples mapped days to visible celestial bodies to impose order on time, while naming months after gods or rulers reinforced cultural values and authority.
The recurrence of certain roots, such as Latin numerals for months or Norse gods for days, reflects the layered history of cultural influence — Roman, Germanic, Norse — and the spread of Christianity, which adapted rather than erased previous traditions.
Modern English preserves this blend because these names became standardized through medieval liturgy, scholarly Latin, and legal documents, which anchored them firmly in daily life and governance.
Surprising Origins in Days & Months
Some etymologies in this domain defy expectations. For instance, Saturday is the only English weekday named directly after a Roman god, despite England’s strong Norse and Germanic linguistic heritage. This survival hints at Saturn’s enduring symbolic importance.
Another surprise lies in April’s uncertain origin. Though long thought to derive from ‘aperire’ (to open), some scholars argue it might come from Aphrodite, the Greek goddess, indicating cross-cultural blending.
Also noteworthy is the naming of July and August, which departed from purely religious or mythological roots to honor political figures, showing how calendars can serve propaganda and legacy-building.
Finally, the fact that the last four months retain numeric names that no longer correspond to their calendar positions highlights how historical shifts in the calendar system left linguistic fossils in modern timekeeping.
FAQ
Why are the days of the week named after gods?
The days are named after gods because ancient cultures linked each day to celestial bodies, which were personified as gods. This helped organize time and imbued it with religious significance.
Why do some months have names that mean numbers but don’t match their position?
Months like September, October, November, and December were originally the 7th, 8th, 9th, and 10th months in the Roman calendar before January and February were added at the start of the year.
Why is Saturday named after a Roman god but other days are named after Norse gods?
Saturday retained its Roman origin due to the strong cultural and religious significance of Saturn and because the day names in English evolved from a mix of Roman and Germanic traditions, preserving some Roman names.
What is the origin of the word 'calendar'?
'Calendar' comes from the Latin 'kalendae,' referring to the 'calling' or announcement of the new moon, which marked the start of a new month in the Roman calendar.
How did the names of July and August change from their original Latin forms?
July and August were originally called Quintilis and Sextilis, meaning fifth and sixth months respectively. They were renamed to honor Julius Caesar and Augustus Caesar.
What is the significance of January’s name?
January is named for Janus, the Roman god of beginnings, transitions, and doorways, symbolizing the start of the new year.
Key Terms: Origin & Usage
| Term | Origin / Source Language | Field Usage & Significance |
|---|---|---|
| Monday | Old English mōnandæg (Moon’s day) — from Proto-Germanic *mēnōnōdagaz | The day named for the Moon, second day of the week in many cultures. |
| Tuesday | Old English Tīwesdæg (Tiw’s day) — Norse god Týr (god of war) | Named after the Norse god of war, equivalent to Mars in Roman culture. |
| Wednesday | Old English Wōdnesdæg (Woden’s day) — Norse god Odin (Woden) | Day named after Odin, chief god in Norse mythology. |
| Thursday | Old English Þūnresdæg (Thor’s day) — Norse god Thor | Day named for Thor, god of thunder. |
| Friday | Old English Frīgedæg (Frigg’s day) — Norse goddess Frigg | Day named after the goddess of love and fertility. |
| Saturday | Latin Saturni dies (Saturn’s day) — Roman god Saturn | The only English weekday named directly after a Roman god. |
| Sunday | Old English Sunnandæg (Sun’s day) — from Proto-Germanic *sunnōn dagaz | Day named for the Sun, first day of the week in many cultures. |
| January | Latin Ianuarius — from Janus, Roman god of beginnings and doorways | First month of the year, symbolizing new beginnings. |
| February | Latin Februarius — from Februa, Roman festival of purification | Month associated with cleansing rites. |
| March | Latin Martius — from Mars, Roman god of war | Third month, originally the start of the Roman calendar year. |
| April | Latin Aprilis — possibly from aperire (to open), referring to spring buds | Month linked to springtime and growth. |
| May | Latin Maius — from Maia, Roman goddess of fertility | Month named after a nurturing goddess. |
| June | Latin Iunius — from Juno, Roman goddess of marriage and childbirth | Month linked with marriage and family. |
| July | Latin Julius — named for Julius Caesar | Month renamed to honor Julius Caesar. |
| August | Latin Augustus — named for Emperor Augustus | Month renamed to honor Augustus Caesar. |
| September | Latin September — from septem (seven), seventh month in Roman calendar | Month originally seventh in the Roman calendar. |
| October | Latin October — from octo (eight), eighth month in Roman calendar | Month originally eighth in the Roman calendar. |
| November | Latin November — from novem (nine), ninth month in Roman calendar | Month originally ninth in the Roman calendar. |
| December | Latin December — from decem (ten), tenth month in Roman calendar | Month originally tenth in the Roman calendar. |
| Week | Old English wice, from Latin hebdomada, Greek hebdomas (group of seven) | A cycle of seven days. |
| Calendar | Latin kalendae — the 'calling' of the new moon or first day of the month | System for organizing days and months. |
| Solstice | Latin solstitium — sol (sun) + sistere (to stand still) | Time when the sun appears to stand still, marking seasonal change. |