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19-letter words containing c, u, t

  • difference equation — (mathematics)   A relation between consecutive elements of a sequence. The first difference is D u(n) = u(n+1) - u(n) where u(n) is the nth element of sequence u. The second difference is u(n+2) + a u(n+1) + b u(n) = 0 can be converted to a difference equation (in this case, a second order linear difference equation): D2 u(n) + p D u(n) + q u(n) = 0 and vice versa. a, b, p, q are constants.
  • differential backup — (operating system)   A kind of backup that copies all files that have changed since the last full backup. Each differential backup will include all files in previous differential backups since the full backup so to restore a version of a file, you only need to search the full backup and the relevant differential backup. Some systems support differential backup by associating an "Archive" flag with each file and setting this flag whenever the file is modified to indicate that it should be included in the next backup. A differential backup does not change this flag, whereas an incremental backup resets it.
  • diplomatic immunity — exemption from taxation, searches, arrest, etc., enjoyed by diplomatic officials and their dependent families under international law, and usually on a reciprocal basis.
  • directional coupler — (communications)   (tap) A passive device used in cable systems to divide and combine radio frequency signals. A directional coupler has at least three ports: line in, line out, and the tap. The signal passes between line in and line out ports with loss referred to as the insertion loss. A small portion of the signal power applied to the line in port passes to the tap port. A signal applied to the tap port is passed to the line in port less the tap attenuation value. The tap signals are isolated from the line out port to prevent reflections. A signal applied to the line out port passes to the line in port and is isolated from the tap port. Some devices provide more than one tap output line (multi-taps).
  • director of studies — a member of staff at an educational institution who has responsibility for overseeing the curriculum
  • directory enquiries — Directory enquiries is a service which you can telephone to find out someone's telephone number.
  • discretionary trust — a trust in which the beneficiaries' shares are not fixed in the trust deed but are left to the discretion of other persons, often the trustees
  • discriminated union — (theory)   The discriminated union of two sets A and B is A + B = {(inA, a) | a in A} U {(inB, b)| b in B} where inA and inB are arbitrary tags which specify which summand an element originates from. A type (especially an algebraic data type) might be described as a discriminated union if it is a sum type whose objects consist of a tag to say which part of the union they belong to and a value of the corresponding type.
  • discussion document — a document that puts forward some ideas or opinions that might form the basis of a discussion of a particular topic
  • disjunctive pronoun — an inflection of pronouns in some languages that is used alone or after a preposition, such as moi in French
  • distance university — a degree-granting institution operating wholly or mainly by correspondence courses for students not resident on or within commuting distance of the campus.
  • distillation column — a type of still fitted with interior baffles, used for fractional distillation. Compare still2 (def 1).
  • distinctive feature — a feature of the sound system of a language that serves as the crucial distinguishing mark between two phonemes, as the distinctive feature of voicing, which distinguishes b from p in English, or nasality, which distinguishes m from b and p.
  • domain architecture — (systems analysis)   A generic, organisational structure or design for software systems in a domain. The domain architecture contains the designs that are intended to satisfy requirements specified in the domain model. A domain architecture can be adapted to create designs for software systems within a domain and also provides a framework for configuring assets within individual software systems.
  • double counterpoint — invertible counterpoint using two transposable voices.
  • draw the curtain on — to end
  • duplicating machine — a duplicator, especially one for making identical copies of documents, letters, etc.
  • dutchman's-breeches — a plant, Dicentra cucullaria, of the fumitory family, having long clusters of pale-yellow, two-spurred flowers.
  • earthquake coverage — Earthquake coverage is insurance coverage for damage caused by earthquakes.
  • eat someone's lunch — to take into the mouth and swallow for nourishment; chew and swallow (food).
  • ecumenical movement — See under ecumenical (def 4).
  • education committee — a committee that discusses the education of children in a particular local authority
  • educational adviser — a person who provides advice and training to teachers about teaching methods and educational policies
  • elastomeric closure — An elastomeric closure is a component that closes a piece of packaging. An elastomeric closure is made from a material that is able to resume its original shape when it is removed from the packaging and may be in direct contact with the drug enclosed in the pack.
  • electroconductivity — Electrical conductivity.
  • electroluminescence — Luminescence produced electrically, especially in a phosphor by the application of a voltage.
  • electron multiplier — a device for amplifying and measuring a flux of electrons. Each electron hits an anode surface and releases secondary electrons that are accelerated to a second surface; after several such stages a measurable pulse of current is obtained
  • electrostatic units — the system of CGS electric and magnetic units that assigns the value of one to the dielectric constant of a vacuum
  • electrotherapeutics — (medicine) the use of electricity in therapeutics.
  • endowment assurance — a form of life insurance that provides for the payment of a specified sum directly to the policyholder at a designated date or to his beneficiary should he die before this date
  • endowment insurance — Endowment insurance is a type of life insurance that pays a particular sum directly to the policyholder at a stated date, or to a beneficiary if the policyholder dies before this date.
  • entry qualification — the qualifications and conditions required to join an organization, club, etc
  • euclidean algorithm — Euclid's Algorithm
  • executive agreement — an agreement made between the US President and the head of a foreign state, having the effect of a treaty
  • executive committee — the executive committee or board of an organization is a committee within that organization which has the authority to make decisions and ensures that these decisions are carried out
  • executive president — a president in certain systems of government who possesses wide powers
  • executive privilege — Executive privilege is the right that a member of the executive branch of government has to withhold information about matters that they consider to be confidential.
  • executive secretary — supports executives or departments
  • factitious disorder — any of various syndromes, as Münchausen syndrome, characterized by physical or psychological symptoms intentionally produced by a person and under voluntary control.
  • facultative apomict — a plant that can reproduce sexually or asexually.
  • fellow countrywoman — a fellow countrywoman is a female citizen of the same state as the person speaking, writing, or being referred to
  • fetch-execute cycle — (architecture, processor)   The sequence of actions that a central processing unit performs to execute each machine code instruction in a program. At the beginning of each cycle the CPU presents the value of the program counter on the address bus. The CPU then fetches the instruction from main memory (possibly via a cache and/or a pipeline) via the data bus into the instruction register. From the instruction register, the data forming the instruction is decoded and passed to the control unit which sends a sequence of control signals to the relevant function units of the CPU to perform the actions required by the instruction such as reading values from registers, passing them to the ALU to add them together and writing the result back to a register. The program counter is then incremented to address the next instruction and the cycle is repeated. The fetch-execute cycle was first proposed by John von Neumann.
  • flannelmouth sucker — a sucker, Catostomus latipinnis, of the Colorado River and its tributaries.
  • focal plane shutter — an opaque shield in a camera, lying in the focal plane of the lens, that, when tripped, admits light to expose the film or plate for a predetermined period, usually a fraction of a second
  • focal-plane shutter — a camera shutter situated directly in front of the film.
  • for crying out loud — exasperation
  • forensic accountant — an accountant who specializes in applying accountancy skills to the purposes of the law
  • foundation subjects — the subjects studied as part of the National Curriculum, including the compulsory core subjects
  • four colour theorem — four colour map theorem
  • fractional currency — coins or paper money of a smaller denomination than the basic monetary unit.
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