hysteron proteron

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A figure of speech in which the natural or rational order of its terms is reversed, as in bred and born instead of born and bred.
• noun The logical fallacy of assuming as true and using as a premise a proposition that is yet to be proved.

from The Century Dictionary.

• noun In rhetoric, a figure by which what should come last in order of time or of logical sequence is introduced first, and vice versa; a transposition of words involving an inversion of the natural and logical order of events or subjects.
• noun In logic, the fallacy which consists in offering as a proof of what is really an axiom some theorem which can be proved only by means of that axiom.

from the GNU version of the Collaborative International Dictionary of English.

• A figure in which the natural order of sense is reversed; hysterology.”
• An inversion of logical order, in which the conclusion is put before the premises, or the thing proved before the evidence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun rhetoric A figure of speech in which a phrase that should come last is put first; hysterology.
• noun An inversion or reversal of the natural order of things.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the logical fallacy of using as a true premise a proposition that is yet to be proved
• noun reversal of normal order of two words or sentences etc. (as in `bred and born')