seventh (adj.)

"next in order after the sixth, last in order of a series of seven; being one of seven equal parts into which a whole is or may be divided;" c. 1300, a new formation from seven + -th (1).

It replaced earlier sevende, seveth, from Old English seofunda (Anglian, Northumbrian), seofoþa (West Saxon), which is from Proto-Germanic *sebundon, *sebunthon (source also of Old Norse sjaundi, Danish syvende, Old Frisian sigunda, Old Saxon sivondo, Old High German sibunto, German siebente, siebte), from *sebun "seven." Compare Sanskrit septatha "seventh."

Compare Middle English niend, ninde, earlier for "ninth," from late Old English nigende; also earlier Middle English tende, tiende "tenth" (cognate with Old Norse tiundi, Old Frisian tianda, Old Saxon tehando).

Used as a noun from late Old English, "the (man, hour, etc.) next in order after the sixth;" by 1550s as "one of the seven equal parts into which a whole may be divided." Related: Seventhly (Middle English seventhli).

In music, by 1590s as "tone on the 7th degree above or below a given tone," also "interval between any tone and a tone the seventh degree above it.

All kinds of sevenths are classed as dissonances, the minor seventh being the most beautiful and the most useful of dissonant intervals. The seventh produced by taking two octaves downward from the sixth harmonic of the given tone is sometimes called the natural seventh; it is sometimes used in vocal music, and on instruments, like the violin, whose intonation is not fixed. [Century Dictionary]

Seventh-day for "Saturday" (the seventh day of the week) is by 1680s in the depaganized weekday names of the Society of Friends. Also in reference to Saturday as the sabbath of the Jews, hence Seventh-Day Adventist (by 1860), etc.

Entries linking to seventh

seven (adj., n.)

"1 more than six; the cardinal number which is one more than six; a symbol representing this number;" Old English seofon, from Proto-Germanic *sebun (source also of Old Saxon sibun, Old Norse sjau, Swedish sju, Danish syv, Old Frisian sowen, siugun, Middle Dutch seven, Dutch zeven, Old High German sibun, German sieben, Gothic sibun), from PIE *septm "seven" (source also of Sanskrit sapta, Avestan hapta, Hittite shipta, Greek hepta, Latin septem, Old Church Slavonic sedmi, Lithuanian septyni, Old Irish secht, Welsh saith).

Long regarded as a number of perfection (seven wonders; seven sleepers, the latter translating Latin septem dormientes; seven against Thebes, etc.), but that notion is late in Old English and in German a nasty, troublesome woman could be eine böse Sieben "an evil seven" (1662). Magical power or healing skill associated since 16c. with the seventh son ["The seuenth Male Chyld by iust order (neuer a Gyrle or Wench being borne betweene)," Thomas Lupton, "A Thousand Notable Things," 1579]. The typical number for "very great, strong," as in seven-league boots in the fairy story of Hop o'my Thumb. Also, formerly, in combination with days, years, etc., indicating merely a very long time.

By early 15c. as "the hour of 7 o'clock." As a high-stakes number for a throw in dice, late 14c. The Seven Years' War (1756-63) is also the Third Silesian War. The Seven Stars (Old English sibunsterri), usually refers to the Pleiades, though in 15c. and after this name occasionally was given to the Big Dipper (which also has seven stars), or the seven planets of classical astronomy. Popular as a tavern sign, it might also (with six in a circle, one in the center) be a Masonic symbol.

FOOL: ... The reason why the seven stars are no more than seven is a pretty reason.

LEAR: Because they are not eight?

FOOL: Yes, indeed: thou wouldst make a good fool.

["King Lear," I.v.]

-th (1)

word-forming element making ordinal numbers (fourth, tenth, etc.), Old English -ða, from Proto-Germanic *-tha- (cognates: Gothic -da, -ta, Old High German -do, -to, Old Norse -di, -ti), from PIE *-to-, also *-eto-, *-oto-, suffix forming adjectives "marking the accomplishment of the notion of the base" [Watkins].

Cognate with Sanskrit thah, Greek -tos, Latin -tus; Sanskrit ta-, Lithuanian and Old Church Slavonic to, Greek to "the," Latin talis "such;" Greek tēlikos "so old, of such an age," Old Church Slavonic toli "so, to such a degree," toliku "so much," Russian toliko "only;" also see -ed.