19-letter words containing a, r, i
- algebraic extension — a field containing a given field such that every element in the first field is algebraic over the given field.
- algebraic operation — any of the mathematical operations of addition, subtraction, multiplication, division, raising to a power, or extraction of a root.
- algebraic structure — (mathematics) Any formal mathematical system consisting of a set of objects and operations on those objects. Examples are Boolean algebra, numerical algebra, set algebra and matrix algebra.
- algorithmic trading — trading on international stock exchanges using computers that have been programmed to buy and sell shares according to fixed rules
- alice-in-wonderland — fantastic; irrational
- all in a day's work — If you say that a task is all in a day's work for someone, you mean that they do not mind doing it although it may be difficult, because it is part of their job or because they often do it.
- all-risks insurance — insurance that covers all risks to property except any types that are specifically excluded or limited in the policy
- all-terrain vehicle — a vehicle with treads or wheels designed to travel on rough ground
- alpha canis majoris — Sirius
- alpha canis minoris — Procyon
- alpha ursae minoris — Polaris
- alternating current — An alternating current is an electric current that continually changes direction as it flows. The abbreviation AC is also used.
- alternating voltage — a voltage that reverses direction in regular cycles.
- alternative history — a genre of fiction in which the author speculates on how the course of history might have been altered if a particular historical event had had a different outcome
- alternative pathway — the activation of complement by contact with polysaccharides on bacteria, protozoa, or yeast cells: a nonspecific immune response. Compare classical pathway.
- alternative society — a society or social group that espouses values different from those of the established social order.
- aluminium hydroxide — a white crystalline powder derived from bauxite and used in the manufacture of glass and ceramics, aluminium and its salts, and in dyeing. Formula: Al(OH)3 or Al2O3.3H2O
- alzheimer's disease — Alzheimer's disease is a condition in which a person's brain gradually stops working properly.
- ambient temperature — Ambient temperature is the temperature of the air surrounding a component.
- ambulance insurance — Ambulance insurance is insurance cover that covers the cost of an emergency ambulance if one is needed.
- american black bear — a bear, Euarctos (or Ursus) americanus, inhabiting forests of North America. It is smaller and less ferocious than the brown bear
- american book award — any of several awards given annually since 1980 to an author whose book is judged the best in its category: administered by the Association of American Publishers. Abbreviation: ABA, A.B.A.
- american crab apple — a twiggy, stiff-branched tree, Malus coronaria, of southern central North America, having small fruit and rose-colored flowers that change to white.
- american directoire — a style of American furniture making and related crafts from c1805 to c1815, corresponding to the French Directoire and English Regency styles.
- american revolution — a sequence of actions by American colonists from 1763 to 1775 protesting British domination and culminating in the Revolutionary War
- american smoke tree — a small tree, Cotinus obovatus, of the cashew family, of the central southern U.S., having yellowish flowers and clusters of fleshy fruit with silky plumes.
- american wire gauge — American wire gauge is a measure of wire thickness.
- ammonium bifluoride — a white, crystalline, water-soluble, poisonous solid, NH 4 HF 2 , used chiefly for cleaning and sterilizing brewing and dairy equipment.
- anaerobic digestion — the conversion of biodegradable waste matter into compost in the absence of oxygen
- analytical geometry — the branch of geometry that uses algebraic notation and analysis to locate a geometric point in terms of a coordinate system; coordinate geometry
- anarcho-syndicalism — syndicalism.
- anarcho-syndicalist — syndicalism.
- ancillary equipment — Ancillary equipment is machines and other technical things which are used with the main items of equipment to create a complete system.
- angioneurotic edema — swelling that occurs just beneath the surface of the skin or mucous membranes.
- angle of depression — depression (def 11).
- angle of reflection — the angle that a beam of reflected radiation makes with the normal to a surface at the point of reflection
- angle of refraction — the angle that a refracted beam of radiation makes with the normal to the surface between two media at the point of refraction
- anno urbis conditae — in a (specified) year from the founding of the city: the ancient Romans reckoned dates from Rome's founding, c. 753 b.c.
- antarctic peninsula — the largest peninsula of Antarctica, between the Weddell Sea and the Pacific: consists of Graham Land in the north and the Palmer Peninsula in the south
- anterograde amnesia — amnesia caused by brain damage in which the memory loss relates to events occurring after the damage
- anthropic principle — the cosmological theory that the presence of life in the universe limits the ways in which the very early universe could have evolved
- anthropocentrically — regarding the human being as the central fact of the universe.
- anthropomorphically — ascribing human form or attributes to a being or thing not human, especially to a deity.
- anti-comintern pact — a pact formed in 1936, based on agreements between Germany and Japan to oppose communism and the Third International: Italy and Spain subsequently became signatories.
- anti-prohibitionist — a person who favors or advocates prohibition.
- anticholinesterases — Plural form of anticholinesterase.
- anticipatory breach — a declaration by one party to a contract that it does not intend to fulfil its obligations to the second party, who can then accept this declaration and choose not to be bound by the contract
- antigua and barbuda — a state in the Caribbean, comprising the islands of Antigua, Barbuda, and Redonda: gained independence in 1981: a member of the Commonwealth. Official language: English. Religion: Christian majority. Currency: East Caribbean dollar. Capital: St John's. Pop: 90 156 (2013 est). Area: 442 sq km (171 sq miles)
- antimony trisulfide — a black or orange-red crystalline compound, Sb2S3, used as a pigment, in pyrotechnics and matches, for fireproofing fabrics and paper, etc.
- antoine louis barye — Antoine Louis [ahn-twan lwee] /ɑ̃ˈtwan lwi/ (Show IPA), 1795–1875, French sculptor and painter.