Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. 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 converse.
from the GNU version of the Collaborative International Dictionary of English
 n. 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 converse. See converse, n. (Logic).
from The Century Dictionary and Cyclopedia
 n. That which is to be converted; specifically, in logic, a proposition which is or is to be transformed by conversion; the premise of the immediate inference of conversion. See conversion, 2.
Etymologies
Examples

_ 'The given proposition is called the' convertend '; that which is derived from it, the' converse. '

Hence we should necessarily have a term distributed in the converse which was not distributed in the convertend.

In each of the following forms of inference the converse differs in quality from the convertend and has the contradictory of one of the original terms

B is A, 'we should be distributing the term B in the converse, which was not distributed in the convertend.

Adopting then this slight extension of the term, we define conversion by negation as  A form of conversion in which the converse differs in quality from the convertend, and has the contradictory of one of the original terms.

If we take the proposition: _Some S is not P_, to convert this into _No P is S_, or _Some P is not S_, would break the rule in chap.vi. ยง 6; since _S, _ undistributed in the convertend, would be distributed in the converse.

Here the convertend and the converse say the same thing, and this is true if that is.

And the same plan has some advantage in converting A.; for by the usual method _per accidens_, the converse of A. being I., if we convert this again it is still I., and therefore means less than our original convertend.

In both these cases, Wealth, though undistributed in the convertend, is distributed in the converse.
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