Origins of the name
It was named no later than the second century for the planet (Saturn), which controlled the first hour of that day according to Vettius Valens. The planet was named for the Roman god of agriculture Saturn. It has been called dies Saturni ("Saturn's Day"), through which from it entered into Old English as Sæternesdæg and gradually evolved into the word "Saturday".

Saturday is the only day of the week in which the English name comes from Roman mythology. The English names of all of the other days of the week come from Anglo-Saxon polytheism. In India, Saturday is Shanivar, based on Shani, the Vedic God manifested in the planet Saturn. In the Thai solar calendar of Thailand, the day is named from the Pali word for Saturn, and the color associated with Saturday is purple. The Celtic languages also name this day for Saturn: Irish an Satharn or dia Sathuirn, Scottish Gaelic Disathairne, Welsh dydd Sadwrn, Breton disadorn.

In Jewish tradition Saturday is the Shabbat. Christianity adopted this tradition in terms of the Sabbath. Thus, in many languages the Saturday is named after the Sabbath. Eastern Orthodox churches distinguish between the Sabbath (Saturday) and the Lord's Day (Sunday). Roman Catholics put so little emphasis on that distinction that many among them follow at least in colloquial language the Protestant practice of calling Sunday the sabbath (see Sabbath in Christianity). Quakers traditionally refer to Saturday as "Seventh Day" eschewing the "pagan" origin of the name. In Islamic countries, Fridays are holidays, however they are considered as the sixth day of the week.

In the Eastern Orthodox Church Saturdays are days on which the Theotokos (Mother of God) and All Saints are commemorated, The day is also a general day of prayer for the dead, because it was on a Saturday that Jesus lay dead in the tomb. The Octoechos contains hyms on these themes, arranged in an eight-week cycle, that are chanted on Saturdays throughout the year. At the end of services on Saturday, the dismissal begins with the words: "May Christ our True God, through the intercessions of his most-pure Mother, of the holy, glorious and right victorious Martyrs, of our reverend and God-bearing Fathers". For the Orthodox, Saturday is never a strict fast day. When a Saturday falls during one of the fasting seasons (Great Lent, Nativity Fast, Apostles' Fast, Dormition Fast) the fasting rules are always lessened to an extent. The Great Feast of the Exaltation of the Cross and the Beheading of St. John the Baptist are normally observed as strict fast days, but if they fall on a Saturday or Sunday, the fast is lessened.

In Scandinavian countries, Saturday is called Lördag or Löverdag etc., the name being derived from the old word laugr (hence Icelandic name Laugardagur), meaning bath, thus Lördag equates to bath-day. This is due to the Viking usage of bathing on Saturdays.

Today, Saturday is officially called Samstag in all German-speaking countries, however, there are two names for this day in modern Standard German. Samstag is always used in Austria, Liechtenstein, the German speaking part of Switzerland and generally used in southern and western Germany. It derives from Old High German sambaztac, which itself derives from Greek , and this Greek word derives from Hebrew (Shabbat). However, the current German word for sabbath is Sabbat. The second name for Saturday in German is Sonnabend, which derives from Old High German sunnunaband, and is closely related to the Old English word sunnanæfen. It means literally "Sun eve", i.e. "The day before Sunday". Sonnabend is generally used in northern and eastern Germany, and was also the official name for Saturday in East Germany. In the Westphalian dialects of Low Saxon, in East Frisian Low Saxon and in the Saterland Frisian language, Saturday is called Satertag, also akin to Dutch Zaterdag, which has the same linguistic roots as the English word Saturday.

Similarly, the Romance languages follow the Greek usage, so that their word for "Saturday" is also a variation on "Sabbath": the Italian is sabato, the French is samedi, the Spanish and Portuguese is sábado and the Romanian is sâmbt.

The modern Maori name for it, Rahoroi, means "washing-day". For other languages, see Days of the week Planetary table.

Position in the week
The three Abrahamic religions, via their original languages, regard Saturday as the seventh day of the week (Judaism via Hebrew, Christianity via Ecclesiastical Latin, and Islam via Arabic) by naming Monday, Tuesday, Wednesday, and Thursday as the second through fifth days of the week. This is concordant with the European Pagan tradition, which named the days of the week after the seven Classical planets (in order Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn), naming the first day of the week for the Sun, perceived as most important, and moving to those perceived as lesser.

The Slavic languages regard Saturday as the sixth day of the week by naming Tuesday, Thursday, and Friday as the second, fourth, and fifth days of the week, although their name for Wednesday, middle, would imply that Saturday is the seventh day of the week.

Beginning in the twentieth century, many Europeans have considered Saturday the sixth (penultimate) day of the week, and Sunday the last[citation needed]. This current European labour-oriented convention has been formalized by ISO 8601 which is used by businesses such as airlines in drawing up timetables, etc.


Activities
Saturday is the usual day for elections in Australia and the only day in New Zealand on which elections can be held, and also the preferred election day in the US state of Louisiana.
In many countries where Sundays are holidays, Saturday is part of the weekend, and is traditionally a day of relaxation.
Saturday morning is a notable television time block aimed at children while airing generally animated cartoons.
Many parties are held on Saturdays, because it precedes Sunday, another day of rest. It is common for clubs, bars and restaurants to be open later on Saturday night than on other nights. Thus "Saturday Night" has come to imply the party scene, and has lent its name to the films Saturday Night Fever, which showcased New York discotheques, Uptown Saturday Night, as well as many songs (see below).
Saturday night is also a popular time slot for comedy shows on television. The most famous of these is Saturday Night Live, a skit show that has aired on NBC nearly every week since 1975. Other notable examples include Saturday Night Live with Howard Cosell. This practise lent its name to the film Mr. Saturday Night, starring Billy Crystal.
Saturday was the preferred day to hunt vampires as that was the day they had to remain in their coffins. It was also believed that someone born on a Saturday could see a vampire when it was otherwise invisible.[1]
The amount of criminal activities that take place on Saturday nights has led to the expression, "Saturday night special" a pejorative slang term used in the United States and Canada for any inexpensive handgun.
The Australian Football League Grand Final is traditionally held on the last Saturday in September.
A large majority of football league games are played in the UK on a saturday.

Saturday in popular culture
In the folk rhyme Monday's Child, "Saturday's child works hard for a living".
Saturday Morning Breakfast Cereal is a single-panel webcomic by Zach Weiner.
The Saturday Evening Post

Saturday songs
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Please improve this article if you can. (March 2008)

Because Saturday night is a prime night for parties, many songs refer to it or invoke its spirit.

10:15 On A Saturday Night - The Cure
"Almost Saturday Night" - John Fogerty and Dave Edmunds
Another Saturday Night - Sam Cooke and Cat Stevens
Come Saturday Morning - The Sandpipers
Friday Night, Saturday Morning - The Specials
(Looking For) The Heart of Saturday