20-letter words containing a, n, t, i

occupational disease — Also called industrial disease. a disease caused by the conditions or hazards of a particular occupation.
occupational pension — a pension scheme provided for the members of a particular occupation or by a specific employer or group of employers
occupational therapy — a form of therapy in which patients are encouraged to engage in vocational tasks or expressive activities, as art or dance, usually in a social setting.
ode to a nightingale — a poem (1819) by Keats.
of no/little account — If you say that something is of no account or of little account, you mean that it is very unimportant and is not worth considering.
off-the-job training — training which is carried out away from your normal place of work
olfactory anesthesia — absence or loss of the sense of smell.
omega-minus particle — a baryon with strangeness −3, isotopic spin 0, and negative charge; predicted from the mathematics of the Eightfold Way and subsequently discovered. Symbol: Ω −.
on (or off) the air — that is (or is not) broadcasting or being broadcast
on o's best behavior — If someone is on their best behavior, they are trying very hard to behave well.
on that/this account — You can use on that account or on this account when you want to say that something happens for the reason you have just mentioned.
on the drawing board — in the planning stage
on the shady side of — beyond (a given age); older than
one's heart's desire — If you say that someone or something is your heart's desire, you mean that you want that person or thing very much.
one's spiritual home — Your spiritual home is the place where you feel that you belong, usually because your ideas or attitudes are the same as those of the people who live there.
ontological argument — an a priori argument for the existence of God, asserting that as existence is a perfection, and as God is conceived of as the most perfect being, it follows that God must exist; originated by Anselm, later used by Duns Scotus, Descartes, and Leibniz.
open learning centre — an establishment which provides further education on a flexible part-time basis
operant conditioning — conditioning (def 1).
operating conditions — Operating conditions are a set of conditions for operating a particular system or process.
operation barbarossa — the codename for Hitler's invasion (1941) of Russia
operational calculus — a method for solving a differential equation by treating differential operators as ordinary algebraic quantities, thus obtaining a simpler problem.
operational database — (database) A database containing up-to-date, modifiable data, in contrast to a decision support database.
operational strategy — a plan or set of plans for successfully running a business, etc
operator overloading — overloading
optical mark reading — the reading of marks by an optical device whereby the information can be stored in machine-readable form
organization expense — the costs associated with organizing a business entity and bringing it into existence
orthognathic surgery — the surgical correction of deformities or malpositions of the jaw.
oscillating universe — a variant model of the closed universe in which the universe undergoes cycles of expansion and contraction.
over-intellectualize — to seek or consider the rational content or form of.
overenthusiastically — With excessive enthusiasm.
ovo-lacto vegetarian — a vegetarian who eats eggs and dairy products
ovo-lacto-vegetarian — lacto-ovo-vegetarian.
oxyacetylene welding — welding using an oxyacetylene burner
paint the town (red) — to go on a boisterous spree; carouse
paper qualifications — qualifications gained through official examinations, etc, rather than through experience
parametric equations — one of two or more equations expressing the location of a point on a curve or surface by determining each coordinate separately.
parataxic distortion — a distortion in perception, especially of interpersonal relationships, based on a tendency to perceive others in accordance with a pattern determined by previous experiences.
partial differential — an expression obtained from a given function of several variables by taking the partial derivative with respect to one of the variables and multiplying by the increment in that variable.
particle beam weapon — a weapon that fires particle beams into the atmosphere or space
partitioned data set — (file format) (PDS) A data set on an IBM mainframe that contains members, each of which acts like a separate data set. Partitioned data sets are more space-efficient than individual data sets, because they can put more than one data set on a track. They are also used to hold libraries, with one function per member. The syntax for a member is NAME.OF.PDS(MEMBER) although some systems (such as Phoenix) could use NAME.OF.PDS:MEMBER Original PDSes were of fixed size, and needed frequent compression to recover space after deleting or changing members. Newer PDS/E Extended PDSes do not have this problem.
patagonian toothfish — a large food fish, Dissostichus eleginoides, found in the cold deep waters of the southern Atlantic and Indian oceans
peaceful coexistence — competition without war, or a policy of peace between nations of widely differing political systems and ideologies, especially between Communist and non-Communist nations: peaceful coexistence between the U.S. and the Soviet Union.
peculiar institution — black slavery in the southern U.S. before the Civil War.
pentobarbital sodium — a barbiturate drug used in medicine as a sedative and hypnotic. Formula: C11H17N2O3Na
pentose nucleic acid — a nucleic acid containing a pentose.
periarteritis nodosa — polyarteritis.
periodontal membrane — the collagenous, fibrous connective tissue between the cementum of the tooth and the alveolus.
peroxyacetyl nitrate — an unstable nitrogen compound, found in certain types of smog, that is an irritant, esp. to the eyes and to plants
perpendicular gothic — the style of Gothic architecture in England during the 14th and 15th centuries, characterized by tracery having vertical lines, a four-centred arch, and fan vaulting
personality disorder — any of a group of mental disorders characterized by deeply ingrained maladaptive patterns of behavior and personality style, which are usually recognizable as early as adolescence and are often lifelong in duration.

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