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Related to theories: Scientific theories, Conspiracy theories

domino theory

1. The political theory that, if one country or area adopts communism, then the surrounding ones will as well. The domino theory was a major concern as the Soviet Union expanded its power after World War II.
2. By extension, the idea that an event in one country will result in similar events in the surrounding countries. The string of revolutions that occurred in neighboring countries during the Arab Spring was a great example of domino theory in action.
See also: domino, theory

in theory

according to a theory; theoretically. In theory, if I take my medicine regularly, I will get well. How things work in theory doesn't always match with how things work in reality.
See also: theory

ounce of common sense is worth a pound of theory

Prov. Common sense will help you solve problems more than theory will. The psychologist had many elaborate theories about how to raise her child, but often forgot that an ounce of common sense is worth a pound of theory.

in theory

possibly They could, in theory, have been paid twice if someone hadn't caught the error.
Opposite of: in practice Related vocabulary: in principle
See also: theory
References in classic literature ?
One's own free unfettered choice, one's own caprice, however wild it may be, one's own fancy worked up at times to frenzy--is that very "most advantageous advantage" which we have overlooked, which comes under no classification and against which all systems and theories are continually being shattered to atoms.
If I choose thus to be banal, it is only to remind you that Collier's theories are today as exploded as the ludicrous deductions of the Spanish school.
Victor Lavalle tells us of that historic collision (en plane) on the flank of Hecla between Herrera, then a pillar of the Spanish school, and the man destined to confute his theories and lead him intellectually captive.
I have discussed the question with a noted Martian scientist, a friend of mine; but his theories are still only theories.
Here was material enough for a least a fortnight of sensations and countersensations, of rumored arrests and strange theories.
But in this case, unfortunately, we have not passed the stage of theories.
It is not my duty to indue facts and theories with affinity.
This distinguished scientist has expounded his views in a book entitled "Verschwinden und Seine Theorie," which has attracted some attention, "particularly," says one writer, "among the followers of Hegel, and mathematicians who hold to the actual existence of a so- called non-Euclidean space--that is to say, of space which has more dimensions than length, breadth, and thickness--space in which it would be possible to tie a knot in an endless cord and to turn a rubber ball inside out without 'a solution of its continuity,' or in other words, without breaking or cracking it.
Tons of brew have been consumed over theories to account for it.
A great deal of what I shall have to say is not original; indeed, much recent work, in various fields, has tended to show the necessity of such theories as those which I shall be advocating.
Before considering modern theories, let us look first at consciousness from the standpoint of conventional psychology, since this embodies views which naturally occur when we begin to reflect upon the subject.
And the question of the subject of the picture having brought him to one of his favorite theories, Golenishtchev launched forth into a disquisition on it.
You know, one of those uncouth new people one's so often coming across nowadays, One of those free-thinkers you know, who are reared d'emblee in theories of atheism, scepticism, and materialism.
The geological formation of that portion of the American Union, which lies between the Alleghanies and the Rocky Mountains, has given rise to many ingenious theories.
It's all right as a theory, /une theorie comme une autre/.