What Is The Origin Of "Sleep Tight"?

### noun

1A numerical quantity that is not a whole number (e.g. 1/2, 0.5).

*‘The Mathematics Computation subtest assesses skills in computing with whole numbers, fractions, mixed numbers, decimals, and algebraic equations.’**‘Use the method above to convert it into a fraction with whole numbers in the denominator.’**‘Basic operations with whole numbers, fractions, and decimals were required to solve some problems, although many items required no calculations.’**‘The aim of the first part is to introduce the Hindu numerals, to explain a place value system and to describe addition, multiplication and other arithmetic operations on integers and fractions in both decimal and sexagesimal notation.’**‘Possibly as a consequence of that, the Greek mathematicians thought of fractions in terms of ratios of integers, rather than numbers.’**‘It looks first at area problems, then looks at rules for the addition, subtraction, multiplication and division of fractions.’**‘The math course consists of five subject areas: understanding numbers, using whole numbers, using decimals, using fractions and per cents, and working with data.’**‘Students added several combinations of wood in whole numbers and mixed fractions as they tested the most economical ways to use the lumber.’**‘These most rarely occurring topics were: angles in a quadrilateral, fractions, fraction multiplication, properties of triangles, and the Pythagorean theorem.’**‘In other words, a number is rational if we can write it as a fraction where the numerator and denominator are both integers.’**‘What are the rules for converting fractions to binary and octal and vice versa?’**‘To convert a fraction to a percentage, divide the numerator by the denominator.’**‘Column addition was performed on whole numbers and then on fractions.’**‘They should also be able to understand basic maths and geometry, including fractions, decimals, multiplication and division.’**‘Specifically, children's responses to the less familiar quantities of zero and fractions could shed light on their performance with the more familiar whole numbers.’**‘Others would rewrite the fractions using common denominators.’**‘Sometimes when working with fractions, the hardest thing to find is a common denominator.’**‘Although all these fractions are written differently, they all represent the same quantity.’**‘You may have to multiply both fractions by different numbers to produce the same denominator for both fractions.’**‘The line between the numerator and denominator is known as the fraction bar.’*

2A small or tiny part, amount, or proportion of something.

*‘he hesitated for a fraction of a second’**‘her eyes widened a fraction’**‘Her goal was $60,000 but she was only able to get a fraction of that amount.’**‘It's only a fraction of the amount of money necessary to attend most private schools.’**‘If they did, the insurance company would have been charged a fraction of that amount.’**‘He said hundreds of lives could be saved on the roads every year for a fraction of the amount being spent on rail safety.’**‘The council currently spends a fraction of this amount on all its other roads combined.’**‘Only a fraction of the huge amount of money we pay in road taxes is put into the maintenance and building of roads.’**‘The parasitic wasp is quite tiny, only a fraction of the size of an adult fly.’**‘In terms of proportion, only a fraction of local cotton is transformed and exported as finished goods.’**‘However, the true cost is a fraction of this amount.’**‘Fortunately, a salvage unit was available, at a fraction of that amount.’**‘The victim would be left with only £5,000-a fraction of the amount intended to cover his pain and suffering.’**‘The new process allowed mass production using a fraction of the amount of silver thereby reducing costs.’**‘That amount was only a fraction of the true value of the business, according to farmers of the former co-op.’**‘They had acquired the land for a tiny fraction of that amount.’**‘No one would ever notice a fraction of a cent but with the amount of financial transactions going on those fractions mounted up.’**‘In this way hundreds of small adjustments can be made in a fraction of the time needed by more traditional methods.’**‘Turns out that he produces some rather wonderful music consisting almost entirely of samples, usually only a fraction of a second long.’**‘Her eyes rest on me for a second, and I swear I can see a tiny ghost of a smile for a fraction of a second.’**‘Joule also invented extremely precise thermometers, which could measure temperature changes to within fractions of a degree Fahrenheit.’**‘Each of those putative atoms of element 115 disintegrated within fractions of a second by spontaneously ejecting an alpha particle, which contains two protons and two neutrons.’*

**tiny part**, small part, fragment, snippet, snatch, smattering, selectionView synonyms**tiny amount**, little, bit, touch, hint, soupçon, trifle, mite, scrap, dash, spot, modicum, shade, jot- 2.1A dissenting group within a larger one.
*‘the dominant classes or fractions in capitalist societies’**‘On the other hand, we can see very clearly the fractions within the hardliner camp, again in contrast to what the pro-participation group is saying.’**‘The state, then, is the condensation of a hegemonic relationship between dominant classes and class fractions.’**‘These shifts did not occur without inner turmoil and conflict, and many fractions continue to struggle within the party today.’**‘I think they are likely to lead to conflicts between fragments and fractions within ruling corporate elites.’**‘Most relevant to this essay is Bourdieu's idea of social class fractions that depend on the composition of their three capitals, cultural, social, and economic.’**‘Class fractions are a fundamental feature of corporate capitalism and can become particularly potent fault lines.’**‘For those unversed in the fractions and factions of Labour local politics, here is a glossary.’**‘The Greens have their pro and anti-capitalist fractions and are working though the issue.’**‘Fundamentalism attracts different class fractions across cultural locales in a common struggle against a diminishing or diminished social status, influence, and power.’**‘The lower middle class experiences deprivation relative to the new middle class fractions above them in terms of wealth, power, and prestige.’**‘It is more than simply a political alliance between social forces represented by classes or fractions of classes.’**‘Revisionists distinguished between fractions of the ruling class in a significant way.’**‘The following year a follow up album was released, Time and a Word, by which time fractions were beginning to open up within the ranks of the band as the battle for leadership started.’*

3Chemistry

Each of the portions into which a mixture may be separated according to a physical property such as boiling point or solubility.*‘the third fraction contain alcohols with boiling points of 120–130°C’**‘The aqueous, ethanol and ethyl acetate fractions were slowly evaporated to dryness under vacuum and stored at 4 degreesC for biological study.’**‘The majority of the manufacturing is from the catalytic cracking of ethane, petroleum fractions, and crude oil.’**‘Oil refining separates the various fractions of petroleum by a process called fractional distillation and takes place in a large plant called a refinery.’**‘Of course, there is some overlap of the boiling points and molecular size for these fractions.’**‘Benzene is manufactured industrially by dehydrogenation and dealkylation of appropriate fractions of petroleum.’**‘Total lipid extracts were separated into neutral and polar lipid fractions by column chromatography on Florisil 60-100 mesh.’**‘The supernatant and the precipitate fractions were separated.’**‘This is a generic term for the light hydrocarbon fractions found associated with most oil deposits.’**‘Both are produced by refining crude oil, but the kerosene fraction of the oil is a little heavier.’**‘The resulting soluble organic fractions were analysed for polynuclear aromatic compounds and tested for mutagenic effects.’**‘The cell lysate was then centrifuged at 27 000 g for 30 min at 4°C and the soluble and insoluble fractions were separated through a syringe.’**‘Soluble and insoluble fractions were separated by centrifugation at 8 000 g for 30 min at the extraction temperature.’**‘After incubation, the samples were treated as above, and the supernatant fractions were lyophilized.’**‘The acetone and methanol fractions were combined and dried under nitrogen.’**‘The gum arabic fractions were collected separately and extracted with water/chloroform.’**‘The ethyl acetate of the combined organic fractions was evaporated under reduced pressure.’**‘Cells were collected 48 hr later, and nuclear and cytoplastic fractions were separated.’*

4usually

**the Fraction**mass noun (in the Christian Church) the breaking of the Eucharistic bread.*‘the Fraction may be accompanied by the Agnus Dei’*

**Origin**

Late Middle English via Old French from ecclesiastical Latin fractio(n-) ‘breaking (bread)’, from Latin frangere ‘to break’.