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The act of interchanging the terms of a proposition, as by putting the subject in the place of the predicate, or the contrary.

To change (one proposition) into another, so that what was the subject of the first becomes the predicate of the second.

Any proposition which is subject to the process of conversion; -- so called in its relation to itself as converted, after which process it is termed the conversae. See Converse, n. (Logic).

qually to the same subject. -- Coördinate conjunctions, conjunctions joining independent propositions. Rev. R. Morris.

Something which follows from the demonstration of a proposition; an additional inference or deduction from a demonstrated proposition; a consequence.

on tufted hill. Byron. One day shall crown the alliance. Shak. To crown the whole, came a proposition. Motley.

assumed premises; -- these premises being definitions, axioms, and previously established propositions. Direct, or Positive, demonstration (Logic & Math.), one in which the correct conclusion is the immediate sequence of reasoning from axiomatic or established premises; -- opposed to Indirect, or Negative, demonstratio…

Final; serving to complete; conclusive. [Obs.] "Desitive propositions." I. Watts.

), a process of reasoning which involves the denial of the first of a series of dependent propositions as a consequence of the denial of the last; a species of reductio ad absurdum. Whately.

disjunctive or discretive clause; as, "I resign my life, but not my honor," is a discrete proposition.

Marking distinction or separation; disjunctive. Discretive proposition (Logic & Gram.), one that expresses distinction, opposition, or variety, by means of discretive particles, as but, though, yet, etc.; as, travelers change their climate, but not their temper.

A disjunctive proposition. Coleridge.

thoughts; as, either, or, neither, nor, but, although, except, lest, etc. -- Disjunctive proposition, one in which the parts are connected by disjunctive conjunctions; as it is either day or night. -- Disjunctive syllogism (Logic), one in which the major proposition is disjunctive; as, the earth moves in a circle or…

r contested; or doubtful certainty or propriety; controvertible; as, disputable opinions, propositions, points, or questions. Actions, every one of which is very disputable. Jer. Taylor.

e sides; controversy in words; verbal contest respecting the truth of some fact, opinion, proposition, or argument.

to hesitate in belief; to be undecided as to the truth of the negative or the affirmative proposition; to b e undetermined. Even in matters divine, concerning some things, we may lawfully doubt, and suspend our judgment. Hooker. To try your love and make you doubt of mine. Dryden.

To announce; to declare; to state, as a proposition or argument. Sir W. Hamilton.

An argument consisting of only two propositions, an antecedent and consequent deduced from it; a syllogism with one premise omitted; as, We are dependent; therefore we should be humble. Here the major proposition is suppressed. The complete syllogism would be, Dependent creatures should be humble; we are dependent crea…

That which is enunciated or announced; words in which a proposition is expressed; an announcement; a formal declaration; a statement. Every intelligible enunciation must be either true or false. A. Clarke.

A syllogism which assumes as one of its premises a proposition which was the conclusion of a preceding syllogism, called, in relation to this, the prosyllogism.