18-letter words containing a, c, t, i, v
- deductive database — (database) A combination of a conventional database containing facts, a knowledge base containing rules, and an inference engine which allows the derivation of information implied by the facts and rules. Commonly, the knowledge base is expressed in a subset of first-order logic and either a SLDNF or Datalog inference engine is used.
- descriptive clause — a relative clause that describes or supplements but is not essential in establishing the identity of the antecedent and is usually set off by commas in English. In This year, which has been dry, is bad for crops the clause which has been dry is a nonrestrictive clause.
- detective sergeant — a police officer who investigates crime and who ranks above a detective constable but below a detective inspector
- digital switchover — the process of changing the method of transmitting television from analogue to digital format
- digital video disc — Digital Versatile Disc
- diphtheria vaccine — a vaccine used to produce immunity against diphtheria
- diplomatic service — diplomatic corps
- distracted driving — driving a vehicle while engaging in an activity that has the potential to distract the driver from the task of driving: Bans on cell phone use in cars will help to reduce the dangers of distracted driving.
- double achievement — a representation of the arms of a husband beside those of his wife such that a difference of rank between them is shown.
- dragline excavator — a power shovel that operates by being dragged by cables at the end of an arm or jib: used for quarrying, opencast mining, etc
- driver's education — high-school driving classes
- enantioselectivity — (chemistry) The selectivity of a reaction towards one of a pair of enantiomers.
- environment agency — an official agency providing information on environmental issues, esp rivers, flooding and pollution
- equivalent circuit — an arrangement of simple electrical components that is electrically equivalent to a complex circuit and is used to simplify circuit analysis
- ethical investment — an investment in a company whose activities or products are not considered by the investor to be unethical
- executive chairman — the most senior internal position within a company, combining the duties of chairman and chief executive
- geneva conventions — one of a series of international agreements, first made in Geneva, Switzerland, in 1864, establishing rules for the humane treatment of prisoners of war and of the sick, the wounded, and the dead in battle.
- gravity escapement — an escapement, used especially in large outdoor clocks, in which the impulse is given to the pendulum by means of a weight falling through a certain distance.
- gulf saint vincent — a shallow inlet of SE South Australia, to the east of the Yorke Peninsula: salt industry
- in inverted commas — If you say in inverted commas after a word or phrase, you are indicating that it is inaccurate or unacceptable in some way, or that you are quoting someone else.
- indecent behaviour — the offence of committing indecent acts
- inductive relation — A relation R between domains D and E is inductive if for all chains d1 .. dn in D and e1 .. en in E,
- indus civilization — an ancient civilization that flourished in the Indus River valley, from about 2500 to 1500 b.c.: extensive archaeological excavations at the main sites of Mohenjo-Daro and Harappa in Pakistan.
- industrial vehicle — a vehicle designed for use in industry
- investment account — a bank account in which money is saved long-term to accrue interest
- investment casting — a casting process in which an expendable pattern is surrounded by an investment compound and then baked so that the investment is hardened to form a mold and the pattern material may be melted and run off.
- investment company — a company that invests its funds in other companies and issues its own securities against these investments.
- involuntary muscle — muscle: contracts involuntarily
- italian provincial — designating or of a style of rural, Italian furniture of the 18th and 19th cent., with straight lines and simple decoration, usually of fruitwood or mahogany
- leave in the lurch — a situation at the close of various games in which the loser scores nothing or is far behind the opponent.
- legislative branch — the branch of government having the power to make laws; the legislature.
- limiting adjective — (in English and some other languages) one of a small group of adjectives that modify the nouns to which they are applied by restricting rather than describing or qualifying. This, some, and certain are limiting adjectives.
- linear perspective — a mathematical system for representing three-dimensional objects and space on a two-dimensional surface by means of intersecting lines that are drawn vertically and horizontally and that radiate from one point (one-point perspective) two points (two-point perspective) or several points on a horizon line as perceived by a viewer imagined in an arbitrarily fixed position.
- logical positivism — a philosophical movement that stresses the function of philosophy as a method of criticizing and analyzing science and that rejects all transcendental metaphysics, statements of fact being held to be meaningful only if they have verifiable consequences in experience and in statements of logic, mathematics, or philosophy itself, and with such statements of fact deriving their validity from the rules of language.
- logical positivist — an exponent or follower of logical positivism
- macroinvertebrates — Plural form of macroinvertebrate.
- magnetic variation — variation (def 8).
- maritime provinces — region in Canada
- merchant of venice — a comedy (1596?) by Shakespeare.
- microenvironmental — Pertaining to a microenvironment.
- microgravitational — Of or pertaining to microgravitation.
- microinvertebrates — Plural form of microinvertebrate.
- microwave detector — a device for recording the speed of a motorist
- microwave spectrum — a spectrum of electromagnetic radiations whose wavelengths fall in the microwave range.
- moving bed reactor — A moving bed reactor is a reactor in which a layer of catalyst in the form of granules is moved between a reaction area and a regeneration area.
- mutually exclusive — of or relating to a situation involving two or more events, possibilities, etc., in which the occurrence of one precludes the occurrence of the other: mutually exclusive plans of action.
- mutually recursive — recursion
- natural convection — Natural convection is the loss of heat from a hot solid or liquid into air which is not artificially agitated.
- naval architecture — the science of designing ships and other waterborne craft.
- negative cash flow — the situation when income is less than payments