seven adj : being one more than six [syn: 7, vii] n : the cardinal number that is the sum of six and one [syn: 7, VII, sevener, heptad, septet]
- /ˈsɛvən/, /"sEv@n/
- Rhymes with: -ɛvən
Etymologyseofon, from , from .
- Albanian: shtatë
- American Sign Language: * trreq Amharic: (numeral: ፯)
- Arabic: (numeral: )
- Aymara: paqalqu
- Azeri: yeddi
- Basque: zazpi
- trreq Bengali: (numeral: ৭)
- Bosnian: sedam
- Breton: seizh
- Bulgarian: седем (sédem)
- trreq Burmese: (numeral: ၇)
- Catalan: set
- Cherokee: ᎦᎵᏉᎩ (galiquogi)
- Cornish: seyth
- Corsican: setti
- Crimean Tatar: yedi
- Croatian: sedam
- Czech: sedm
- Danish: syv
- Dena'ina: qents'ughi'i
- Dutch: zeven
- Erzya: сисем (sisem)
- Esperanto: sep
- Estonian: seitse
- Faroese: sjey
- Finnish: seitsemän
- French: sept
- Garífuna: sedü
- Georgian: შვიდი (švidi)
- German: sieben
- Greek: επτά (eptá)
- Guaraní: pokõi
- trreq Gujarati: (numeral: ૭)
- Hebrew: שֶׁבַע (sheva) (used in counting), שִׁבְעָה (shiv'a)
- Hindi: सात (sāt) (numeral: ७)
- Hungarian: hét
- Icelandic: sjö
- Ido: sep
- Ilocano: pito
- Indonesian: tujuh
- Interlingua: septe
- Irish: seacht
- Italian: sette
- Japanese: 七 (しち, shichí; なな, nana, ななつ, nanátsu)
- Javanese: pitu
- Kalaallisut: arfineq marluk
- trreq Kannada: (numeral: ೭)
- Karelian: seiččemän
- Khmer: (pram pī) (numeral: )
- Komi: сізым (sïzym)
- Korean: 일곱 (ilgop), 칠 (chil)
- Kurdish: heft,
- trreq Lao: (numeral: )
- Latin: septem
- Latvian: septiņi , septiņas
- Lithuanian: septyni, septynios
- Livonian: seis
- Lojban: ze
- Malagasy: fito
- trreq Malayalam: (numeral: ൭)
- Maltese: sebgħa
- Manchu: nadan
- Manx: shiaght
- Maori: whitu
- Mari: шымыт (šymyt)
- Maricopa: pxkyeek
- Marshallese: jimjuon
- Mongolian: долоо (numeral: ᠗)
- Nahuatl: chicome
- Norwegian: sju, syv
- Novial: set
- O'odham: vevkam
- Occitan: sèt
- Old English: seofon
- trreq Oriya: (numeral: ୭)
- Persian: (hæft) (numeral: )
- Polish: siedem
- Portuguese: sete
- Punjabi: ਸੱਤ (satt) (numeral: ੭)
- Quechua: qanchis
- Romanian: şapte
- Russian: семь (sem’)
- Sanskrit: सप्तन् (saptán), सप्त (sapta)
- Scottish Gaelic: seachd
- Sinhala: හත (hatha)
- Slovak: sedem
- Slovene: sedem
- Spanish: siete
- Swedish: sju (^)
- Tagalog: pito
- trreq Tamil: (numeral: ௭)
- Tatar: җиде, cide
- Telugu: ఏడు (numeral: ౭)
- Thai: (jèt) (numeral: )
- trreq Tibetan: (numeral: ༧)
- Tok Pisin: sevenpela
- Turkish: yedi
- Tzutujil: wuku
- Ukrainian: сім (sim), семеро (sémero) collective
- Veps: seicheme
- Vietnamese: bảy
- Volapük: vel
- Votic: seitsee / сеицее
- Võro: säidse
- Welsh: saith
- West Frisian: sân
set or group with seven components
- Lithuanian: septyneri, septynerios
the figure seven
a card bearing seven pips
- Danish: syver
- Finnish: seiska
- Hungarian: hetes
- Russian: семёрка
- ttbc Dutch: zeven (1,2)
- ttbc German: Sieben
- ttbc Norwegian: sjutall ; syvtall
- ttbc Polish: siódemka (1,2)
- ttbc Portuguese: sete (1,2)
- ttbc Romanian: şapte (1); şeptar (2)
- ttbc Slovak: sedmička
- ttbc Swedish: sjua (1,2)
- ttbc Ukrainian: сімка (símka)
- Seven is the 4th prime number.
- Seven is a Mersenne prime, since 2³ - 1 = 7.
- Seven is the fourth Mersenne prime exponent.
- Seven is the first Newman-Shanks-Williams prime.
- Seven is the third Lucas prime.
- Seven is the first Woodall prime.
- Seven is the second lucky prime.
- Seven is the second safe prime.
- Seven is the fourth factorial prime
- Seven is both a Carol number and a Kynea number.
- Seven is the only number less than 15 which cannot be represented as the sum of the squares of three integers.
- Seven is the fourth self number.
- Seven is the smallest happy number, except for the trivial example of 1.
- 999,999 divided by 7 is exactly 142,857. Therefore, when a vulgar fraction with 7 in the denominator is converted to a decimal expansion, the result has the same six-digit repeating sequence after the decimal point, but the sequence can start with any of those six digits. For example, 1/7 = 0.142 857 142.... and 2/7 = 0.285 714 285...
- A seven-sided shape is a heptagon. The regular n-gons for n ≤ 6 can be constructed by compass and straightedge alone, but the regular heptagon cannot. Figurate numbers representing heptagons (including seven) are called heptagonal numbers. Seven is also a centered hexagonal number.
- There are seven frieze groups, the groups consisting of symmetries of the plane whose group of translations is isomorphic to the group of integers.
- A group or a series of seven is a heptad.
- 7 is the only dimension, besides the familiar 3, in which a vector cross product can be defined
- 7 is the first natural number for which the next statement does not hold: "Two nilpotents endomorphisms from \mathbb^ with the same minimal polynomial and the same rank are similar."
In numeral systemsIn quaternary, 7 is the smallest prime with a composite sum of digits.
In the English language, 7 is the only 2-syllable natural, positive 1-digit number
List of basic calculations
Evolution of the glyph
In the beginning, various Hindus wrote 7 more or less in one stroke as a curve that looks like an uppercase J upside down. The western Ghubar Arabs' main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the character more rectilinear. The eastern Arabs developed the character from a 6-look-alike into an uppercase V-look-alike. Both modern Arab forms influenced the European form, a two-stroke character consisting of a horizontal upper line joined at its right to a line going down to the bottom left corner, a line that is slightly curved in some font variants. As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1, though in a different way, so they were also concerned with making their 7 more different. For the Khmer this often involved adding a horizontal line above the glyph. This is analogous to the horizontal stroke through the middle that is sometimes used in handwriting in the Western world but which is almost never used in computer fonts. This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for one in writings that use a long upstroke in the glyph for one.
On the seven-segment displays of pocket calculators and digital watches, 7 is the number with the most common glyph variation (0, 6 and 9 also have variant glyphs). Most calculators use three line segments, but on Sharp, Casio, and a few other brands of calculators, 7 is written with four line segments. The reason is that in Japan & Korea 7 is written as ① in the illustration to the right.
While the shape of the 7 character has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in
- The number of stellar objects in the solar system visible to the naked eye — the Sun, the Moon and the five classical naked eye planets: Mars, Mercury, Jupiter, Venus, and Saturn.
- Messier object M7, a magnitude 3.5 open cluster in the constellation Scorpius.
- The New General Catalogue object NGC 7, a 14th magnitude spiral galaxy in the constellation Sculptor.
- The number of daughters of Atlas in the Pleiades (also called the "seven sisters").
- The number of saints appearing in a constellation called "Saptharishi Mandalam" in Indian astronomy.
- The number of stars in the constellation of The Big Dipper.
- The Saros number of the solar eclipse series which began on -2590 April 8 and ended on -1310 May 16. The duration of Saros series 7 was 1,280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on -2595 July 15 and ended on -1008 February 22. The duration of Saros series 7 was 1,586.6 years, and it contained 89 lunar eclipses.
- The Roman numeral VII stands for white dwarfs in the Yerkes spectral classification scheme.
- The Roman numeral VII (usually) stands for the seventh-discovered satellite of a planet or minor planet (e.g., Jupiter VII).
- The code for international direct dial phone calls to Russia and Kazakhstan.
- The resin identification code used in recycling to identify "other" plastics such as polycarbonate
- The number of digits in an American or Canadian telephone number, excluding the area code.
- In Microsoft's Rich Text Format specification, seven and all numbers congruent to it modulo 256 refer to variants of the German language.
- Windows 7, the upcoming Microsoft operating system sometimes referred to as just "7".
- In the ASCII character set, the bell character.
- There are Seven Tools of Quality.
- There are seven layers in the OSI model.
- There are seven logic gates. NOT, AND, OR, NAND, XOR, NOR, XNOR
- The seven-segment display, is an electronic device that uses seven individual segments to create one digit; it is used in display devices like digital clocks and some basic calculator screens, amongst others.
In the classical worldIn classical antiquity:
- In Judaism:
- A highly symbolic number in the Torah, alluding to the infusion of spirituality and Godliness into the Creation. For example:
- God rested on and sanctified the seventh day (Shabbat).
- A seven-day purification period is required for one who has become tamei to become tahor.
- The Shmita (Sabbatical) year arrives every seventh year.
- The Jubilee (Yovel) year comes after 7 times 7 years.
- The Counting of the Omer leading up to the Giving of the Torah is expressed as "7 times 7 weeks."
- There are 7 days of Passover and Sukkot when celebrated in Israel.
- Shiv`a (another pronunciation of the Hebrew word for 7 -- ()), is the number of days of mourning. Hence, one sits Shiva. As in Shiva (Judaism)
- The weekly Torah portion is divided into seven aliyahs, and seven men or boys over the age of 13 are called up for the reading of these aliyahs during Shabbat morning services.
- Seven blessings are recited under the chuppah during a Jewish wedding ceremony.
- A Jewish bride and groom are feted with seven days of festive meals after their wedding, known as Sheva Berachot ("Seven Blessings").
- The number of Ushpizzin (also known as the "Seven Shepherds") who visit the sukkah during the holiday of Sukkot: Abraham, Isaac, Jacob, Joseph, Moses, Aaron, and David.
- The number of nations God told the Israelites they would displace when they entered the land of Israel (Deut. 7:1): the Hittite, the Girgashite, the Amorite, the Canaanite, the Perizzite, the Hivite, and the Jebusite.
- In Breslov tradition, the seven orifices of the face (2 eyes, 2 nostrils, 2 ears, and the mouth) are called "The Seven Candles."
- The menorah (Hebrew: מנורה), is a seven branched candelabrum lit by olive oil in the Tabernacle and the Temple in Jerusalem. The menorah is one of the oldest symbols of the Jewish people. It is said to symbolize the burning bush as seen by Moses on Mount Sinai (Exodus 25).
- The number of times Cain will be avenged by God if he is murdered (Gen 4:15).
- The Israelites circled Jericho for 7 days and then the wall tumbled down.
- Yahweh or Jehovah is the divine name, whose letters' placed alphabetically equal 70, a product of the divine number 7.
- In Christianity:
- The Seven Sacraments in the Christian faith (though some traditions assign a different number).
- The Seven churches of Asia to which the "Book of Revelation" is addressed.
- The Seven Joys of the Virgin Mary, of Roman Catholic, Anglican, and other traditions.
- The Seven Sorrows of the Virgin Mary, of Roman Catholic, Anglican, and other traditions.
- The Seven Corporal Acts of Mercy of Roman Catholic, Anglican, and other traditions.
- The Seven Spiritual Acts of Mercy of Roman Catholic, Anglican, and other traditions.
- The Seven last words (or seven last sayings) of Jesus on the cross.
- The Seven Virtues: chastity, moderation, liberality, charity, meekness, zeal, and humility.
- The Seven deadly sins: lust, gluttony, greed, sloth, wrath, envy, and pride.
- The seven terraces of Mount Purgatory (one per deadly sin).
- In the genealogy in the Gospel of Luke, Jesus is 77th in a direct line.
- The number of heads of the three beasts (7*10*7+7*10*10+7*10=1260) of the Book of Revelation, and of some other monsters, like the hydra and the number of seals.
- In the New Testament, the Gospel of Matthew 18:21, Jesus says to Peter to forgive seventy times seven times.
- There are seven suicides mentioned in the Bible (OT and NT)