20-letter words containing a, e, t, o

occupation franchise — the right of a tenant to vote in national and local elections
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 beaten track — formed or shaped by blows; hammered: a dish of beaten brass.
off-the-job training — training which is carried out away from your normal place of work
officer of the guard — an officer, acting under the officer of the day, who is responsible for the instruction, discipline, and performance of duty of the guard in a post, camp, or station. Abbreviation: OG, O.G.
officer of the watch — the officer primarily responsible for the navigation of a ship, in the absence of the captain, during a certain watch.
official secrets act — law: legislation protecting state secret
old man of the woods — an edible, mild-tasting mushroom, Strobilomyces floccopus, occurring in coniferous woodlands of eastern North America.
olfactory anesthesia — absence or loss of the sense of smell.
omega-3 (fatty acid) — a type of polyunsaturated fatty acid in fish oil, shellfish, soybeans, etc., linked to low cholesterol and low LDL levels
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 one's own account — If you take part in a business activity on your own account, you do it for yourself, and not as a representative or employee of a company.
on someone's account — Your feelings on someone's account are the feelings you have about what they have experienced or might experience, especially when you imagine yourself to be in their situation.
on the drawing board — in the planning stage
on the factory floor — in a factory; as a factory worker
on the shady side of — beyond (a given age); older than
on the starboard bow — within 45 degrees to the starboard of straight ahead
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
ophthalmodynamometer — a device for determining the nearest point of ocular convergence.
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.
orthopaedic mattress — a specially firm mattress designed to help correct or ameliorate the discomfort of disorders of the spine and joints
oscillating universe — a variant model of the closed universe in which the universe undergoes cycles of expansion and contraction.
ousterhout's fallacy — Ousterhout's dichotomy
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
pale western cutworm — the larva of a noctuid moth, Agrotis orthogonia, of the western U.S. and Canada, that seriously damages grains, beets, potatoes, alfalfa, etc., by feeding underground on roots and stems.
palos verdes estates — a town in S California.
paper chromatography — the separation of mixtures into their constituents by preferential adsorption by a solid, as a column of silica (column chromatography) or a strip of filter paper (paper chromatography) or by a gel.

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