18-letter words containing u, n, a, l, t

numerical identity — the relation that holds between two relata when they are the selfsame entity, that is, when the terms designating them have the same reference
numerical taxonomy — classification of organisms by a comparison of large numbers of observable characteristics that are given equal value instead of being weighted according to possible evolutionary significance.
nursery facilities — places where young children are looked after
occupational group — An occupational group is a category used by insurance companies to classify jobs according to how hazardous they are.
oedipus at colonus — a tragedy by Sophocles, written toward the end of his life and produced posthumously in 401? b.c.
oil of catechumens — holy oil used in baptism, the ordination of a cleric, the coronation of a sovereign, or in the consecration of a church.
on automatic pilot — If you are on automatic pilot or on autopilot, you are acting without thinking about what you are doing, usually because you have done it many times before.
on delicate ground — in a situation requiring tact
optical soundtrack — the final soundtrack on a motion picture, which appears as a band of black and white serrations along a strip of film to the left of the composite print. Light is shined through the serrations and is converted to audible sound.
optimum population — a population that is sufficiently large to provide an adequate workforce with minimal unemployment
out of circulation — If someone is out of circulation, they do not appear in public or at social gatherings for a period of time. You can also say that someone is out of circulation when they are in prison.
parallel computing — parallel processing
parallel evolution — the independent development of closely corresponding adaptive features in two or more groups of organisms that occupy different but equivalent habitats, as marsupial mammals in Australia and placental mammals on other continents.
parallel reduction — A form of applicative order reduction in which all redexes in an expression are reduced simultaneously. Variants include parallel outermost reduction and lenient reduction. See normal order reduction.
paraurethral gland — any of a group of vestigial glands located in the posterior wall of the urethra in women.
partial evaluation — (compiler, algorithm) (Or "specialisation") An optimisation technique where the compiler evaluates some subexpressions at compile-time. For example, Partial evaluation might change the termination properties of the program if, for example, the expression (x * 0) was reduced to 0 it would terminate even if x (and thus x * 0) did not. It may be necessary to reorder an expression to partially evaluate it, e.g. f x y = (x + y) + 1 g z = f 3 z If we rewrite f: f x y = (x + 1) + y then the expression x+1 becomes a constant for the function g and we can say g z = f 3 z = (3 + 1) + z = 4 + z Partial evaluation of built-in functions applied to constant arguments is known as constant folding. See also full laziness.
passing modulation — a modulation of a temporary nature.
payment by results — a system of wage payment whereby all or part of the wage varies systematically according to the level of work performance of an employee
peano's postulates — a collection of axioms concerning the properties of the set of all positive integers, including the principle of mathematical induction.
pennsylvania dutch — the descendants of 17th- and 18th-century settlers in Pennsylvania from southwest Germany and Switzerland.
perceptual defence — the process by which it is thought that certain stimuli are either not perceived or are distorted due to their offensive, unpleasant, or threatening nature
perceptual mapping — the use of a graph or map in the development of a new product, in which the proximity of consumers' images of the new product to those of an ideal product provide an indication of the new product's likely success
perlocutionary act — the action of affecting someone by uttering certain words
perpetual calendar — a calendar devised to be used for many years, as in determining the day of the week on which a given date falls.
physical education — systematic instruction in sports, exercises, and hygiene given as part of a school or college program.
phytohemagglutinin — a lectin, obtained from the red kidney bean, that binds to the membranes of T cells and stimulates metabolic activity, cell division, etc.
play cat and mouse — Also called cat and rat. a children's game in which players in a circle keep a player from moving into or out of the circle and permit a second player to move into or out of the circle to escape the pursuing first player.
plenum ventilation — a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamber (plenum chamber) at a pressure slightly higher than atmospheric pressure, so as to expel foul air.
plumber's merchant — a shop or business that sells things needed for the job of installing and repairing pipes, fixtures, etc, for water, drainage, and gas
political question — a question regarded by the courts as being a matter to be determined by another department of government rather than of law and therefore one with which they will not deal, as the recognition of a foreign state.
population balance — A population balance is a model showing particle sizes during a grinding process, which is used when designing a process.
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 density — ratio: inhabitants to area
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.
pour cold water on — If someone pours cold water on a plan or idea, they criticize it so much that people lose their enthusiasm for it.
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.
principal argument — the radian measure of the argument between −π and π of a complex number. Compare argument (def 8c).
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.
pseudointellectual — a person exhibiting intellectual pretensions that have no basis in sound scholarship.
public corporation — a corporation, owned and operated by a government, established for the administration of certain public programs.
public examination — an examination, such as a GCSE exam, that is set by a central examining board
publicity campaign — an effort to convey information to the public
pulmonic airstream — a current of lung air set in motion by the respiratory muscles in the production of speech.
pulp canal therapy — endodontics.

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