Noun

(en noun)

A number of things or persons being in some relation to one another.

* , chapter=5

, title= The Mirror and the Lamp , passage=Then everybody once more knelt, and soon the blessing was pronounced. The choir and the clergy trooped out slowly, […], down the nave to the western door. […] At a seemingly immense distance the surpliced group stopped to say the last prayer.}}

* {{quote-magazine, date=2013-07-19, author=(Peter Wilby)

, volume=189, issue=6, page=30, magazine=(The Guardian Weekly) , title= Finland spreads word on schools , passage=Imagine a country where children do nothing but play until they start compulsory schooling at age seven. Then, without exception, they attend comprehensives until the age of 16. Charging school fees is illegal, and so is sorting pupils into ability groups by streaming or setting.}}

(group theory) A set with an associative binary operation, under which there exists an identity element, and such that each element has an inverse.

(geometry, archaic) An effective divisor on a curve.

A (usually small) group of people who perform music together.

(astronomy) A small number (up to about fifty) of galaxies that are near each other.

(chemistry) A column in the periodic table of chemical elements.

(chemistry) A functional entity consisting of certain atoms whose presence provides a certain property to a molecule, such as the methyl group.

(sociology) A subset of a culture or of a society.

(military) An air force formation.

(geology) A collection of formations or rock strata.

(computing) A number of users with same rights with respect to accession, modification, and execution of files, computers and peripherals.

An element of an espresso machine from which hot water pours into the portafilter.

(music) A number of eighth, sixteenth, etc., notes joined at the stems; sometimes rather indefinitely applied to any ornament made up of a few short notes.

(sports) A set of teams playing each other in the same division, while at the same time not playing teams that belong to other sets in the division.

*

Noun

(head)

(rare) The loss, seizure, destruction, or killing of one seventh (of something or of a group).

* 1844 , J.A.T., “Observations on the Genius of the Christian Sabbath, as Illustrated in the Life of Wilberforce” in The Oberlin Evangelist VI, ? 5, page 40

To Wilberforce ‘the Sabbath was a delight’ […] O how often, even among those who most punctiliously observe it, does it seem […] an unwelcome exaction, a sort of septimation of time, as grievous as church decimations of property.

* 1853 , William Jackman [aut.] and I. Chamberlayne [ed.], The Australian Captive , chapter XVII, page 206

We had gone into the enemy’s ground with seven hundred warriors?—?a little over one hundred of whom were missing when we left it?—?as, at that time, we could hardly muster six hundred. This septimation of our men was accompanied by a proportionate riddance of such encumbrances of the expedition as wore the shape of women and little ones.