18-letter words containing l, u, r, i, n

pleasure principle — an automatic mental drive or instinct seeking to avoid pain and to obtain pleasure.
plenary indulgence — a remission of the total temporal punishment that is still due to sin after absolution. Compare indulgence (def 6).
population control — a policy of attempting to limit the growth in numbers of a population, esp in poor or densely populated parts of the world, by programmes of contraception or sterilization
population figures — population totals; statistics relating to the size of populations
population pyramid — a graph showing the distribution of a population by sex, age, etc.
portable equipment — Portable equipment is electrical equipment that can easily be moved from one place to another while in operation or while connected to the supply.
portal circulation — blood flow in a portal system.
post-revolutionary — of, pertaining to, characterized by, or of the nature of a revolution, or a sudden, complete, or marked change: a revolutionary junta.
preantepenultimate — third from the end.
presidential suite — a suite of rooms, as in a hotel, suitable for a president or other head of state.
presumption of law — a presumption based upon a policy of law or a general rule and not upon the facts or evidence in an individual case.
presuppositionless — to suppose or assume beforehand; take for granted in advance.
principal argument — the radian measure of the argument between −π and π of a complex number. Compare argument (def 8c).
process scheduling — multitasking
production control — the planning and supervision of manufacturing activities to ensure that goods will be produced on time at the lowest possible cost.
protocol data unit — (PDU) A packet of data passed across a network. The term implies a specific layer of the OSI seven layer model and a specific protocol.
provincial council — (formerly) a council administering any of the New Zealand provinces
public corporation — a corporation, owned and operated by a government, established for the administration of certain public programs.
public expenditure — spending by central government, local authorities, and public corporations
pulmonary embolism — the blockage of a pulmonary artery, often by a blood clot, that stops the flow of blood to the lungs and which can result in death if untreated
pulmonic airstream — a current of lung air set in motion by the respiratory muscles in the production of speech.
quality controller — a person responsible for checking that the goods or services produced by an organization are of an acceptable standard
quartz-iodine lamp — a type of tungsten-halogen lamp containing small amounts of iodine and having a quartz envelope, operating at high temperature and producing an intense light for use in car headlamps, etc
regular expression — 1. (text, operating system) (regexp, RE) One of the wild card patterns used by Perl and other languages, following Unix utilities such as grep, sed, and awk and editors such as vi and Emacs. Regular expressions use conventions similar to but more elaborate than those described under glob. A regular expression is a sequence of characters with the following meanings (in Perl, other flavours vary): An ordinary character (not one of the special characters discussed below) matches that character. A backslash (\) followed by any special character matches the special character itself. The special characters are: "." matches any character except newline; "RE*" (where RE is any regular expression and the "*" is called the "Kleene star") matches zero or more occurrences of RE. If there is any choice, the longest leftmost matching string is chosen. "^" at the beginning of an RE matches the start of a line and "$" at the end of an RE matches the end of a line. (RE) matches whatever RE matches and \N, where N is a digit, matches whatever was matched by the RE between the Nth "(" and its corresponding ")" earlier in the same RE. Many flavours use $RE$ instead of just (RE). The concatenation of REs is a RE that matches the concatenation of the strings matched by each RE. RE1 | RE2 matches whatever RE1 or RE2 matches. \< matches the beginning of a word and \> matches the end of a word. Many flavours use "\b" instead as the special character for "word boundary". RE{M} matches M occurences of RE. RE{M,} matches M or more occurences of RE. RE{M,N} matches between M and N occurences. Other flavours use RE\{M\} etc. Perl provides several "quote-like" operators for writing REs, including the common // form and less common ??. A comprehensive survey of regexp flavours is found in Friedl 1997 (see below). 2. Any description of a pattern composed from combinations of symbols and the three operators: Concatenation - pattern A concatenated with B matches a match for A followed by a match for B. Or - pattern A-or-B matches either a match for A or a match for B. Closure - zero or more matches for a pattern. The earliest form of regular expressions (and the term itself) were invented by mathematician Stephen Cole Kleene in the mid-1950s, as a notation to easily manipulate "regular sets", formal descriptions of the behaviour of finite state machines, in regular algebra.
relative frequency — the ratio of the number of times an event occurs to the number of occasions on which it might occur in the same period.
residual magnetism — remanence.
resurrection plant — a desert plant, Selaginella lepidophylla, occurring from Texas to South America, having stems that curl inward when dry.
return-flue boiler — a fire-tube boiler having flues that collect the combustion gases at the end of the boiler opposite the fire door and pass them through the boiler to an uptake above the fire door.
revolution counter — a device for counting or recording the number of revolutions made by a rotating shaft, as of a motor or engine.
revolutionary wars — American Revolution.
rubbish collection — the collection of domestic refuse for disposal
run in sb's family — If a characteristic runs in someone's family, it often occurs in members of that family, in different generations.
run length limited — (storage) (RLL) The most popular scheme for encoding data on magnetic disks. RLL packs up to 50% more data on a disk than MFM. Groups of bits are mapped to specific patterns of flux. The density of flux transitions is limited by the spatial resolution of the disk and frequency response of the head and electronics. However, transitions must be close enough to allow reliable clock recovery. RLL implementations vary according to the minimum and maximum allowed numbers of transition cells between transitions. For example, the most common variant today, RLL 1,7, can have a transition in every other cell and must have at least one transition every seven cells. The exact mapping from bits to transitions is essentially arbitrary. Other schemes include GCR, FM, Modified Frequency Modulation (MFM). See also: PRML.
running martingale — martingale (def 2).
rural municipality — any lightly settled area in Canada lacking a local elected government and administered directly by a provincial government.
russian revolution — Also called February Revolution. the uprising in Russia in March, 1917 (February Old Style), in which the Czarist government collapsed and a provisional government was established.
safety regulations — regulations or rules that are put in place to ensure a product, event, etc, is safe and not dangerous
sampling frequency — sample rate
saturated solution — A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve.
sault sainte marie — the rapids of the St. Marys River, between NE Michigan and Ontario, Canada.
schwarz inequality — Also called Cauchy's inequality. the theorem that the inner product of two vectors is less than or equal to the product of the magnitudes of the vectors.
scripting language — a language that is used to write scripts, or executable sections of code that automate tasks.
securities analyst — an expert who advises on investment in securities such as stocks, shares and bonds
security clearance — access to top secret information
selenium rectifier — a rectifier consisting of laminated plates of metal, usually iron, that have been coated with selenium on one side, with rectification taking place because the flow of electrons from the conductive metal to the selenium occurs more readily than the flow in the opposite direction.
self-instructional — pertaining to or constituting learning materials and conditions arranged so that students can proceed to learn on their own with little or no supervision.
self-preoccupation — the state of being preoccupied.
self-raising flour — flour with baking powder
self-understanding — mental process of a person who comprehends; comprehension; personal interpretation: My understanding of the word does not agree with yours.
semicircular canal — any of the three curved tubular canals in the labyrinth of the ear, associated with the sense of equilibrium.

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