# preexchange
## English
### Etymology

From pre- +‎ exchange.

### Adjective

preexchange (not comparable)
* Occurring before an exchange.
** 1980, Herman Kelting, Real estate investments, page 216:Reconsider preexchange financing strategy for alternative outcomes that may be more favorable to the parties.
** 1999, David D. Weaver, Ira K. Brandt, Catalog of Prenatally Diagnosed Conditions, →ISBN, page 75:Normal total serum protein and albumin concentrations from cord and preexchange blood samples were within normal limits (5.8 g/dL and 3.3 g/dL, respectively).
** 2008, Journal of Public Policy & Marketing:In contrasting the preexchange and postexchange stages for both benefits and harms (see Table 1), the degree of potential harms and benefits is heightened and more pronounced in the postexchange stage.

### Noun

preexchange (plural preexchanges)
* An exchange that takes place beforehand.
** 1969, The Law Society's Gazette - Volume 66, page 580:The solicitor acting for the vendor in one of these cases had cause to telephone the writer this afternoon to request an early date for exchange of contracts, and, upon being advised of the horror with which the writer had viewed the above clause, advised that she quite agreed with the views expressed, to whit that such a clause made mockery of the whole question of preexchange of contract enquiries, but said that this clause was now put into virtually all contracts prepared by Kent solicitors.
** 1985, George F. Jelen, Information Security: An Elusive Goal:On the other hand, one of the most critical concerns in a cryptographic or COMSEC system is that of key management — the method used to effect the necessary preexchange of private information to permit successful intercommunication over an encrypted link.
** 1989, Norman J. Oppenheimer, Thomas L. James, Nuclear Magnetic Resonance - Volume 177, page 35:Both chiral derivatives can be produced by making use of preexchange of the β positions of 2-oxoglutarate in $^2$H$_2$O.
** 2011, Faïza Bergaya, B.K.G. Theng, G. Lagaly, Handbook of Clay Science, →ISBN, page 403:The advantage of this latter in-situ method is less time-consuming than the former because the intercalant does not have to be prepared separately, and no preexchange of the starting clay mineral is required.
* An interaction that introduces and leads to but is not yet a true exchange.
** 1983, Jürgen Streeck, Social Order in Child Communication: A study in microethnography, →ISBN:This co-construction of reading turns is made to happen in a series of preexchanges (Kendon 1977) in which the girls lead each other to a conversational slot where a joint beginning of the reading is possible.
** 2005, Maria Pilar Safont Jordà, Third Language Learners: Pragmatic Production and Awareness, →ISBN:The former group corresponds to Edmondson's preexchanges (1981); that is, initiation moves that focus to the speaker's assurance of fulfilment before making the request: (8) Can I ask you a question? (9) Could you do me a favour?

### Verb

preexchange (third-person singular simple present preexchanges, present participle preexchanging, simple past and past participle preexchanged)
* To exchange beforehand.
** 1975, IBM Technical Disclosure Bulletin - Volume 18, Issue 2, page 488:Information indicating current associations of mask bits and nodal access ports, is preexchanged between access nodes via control signaling segments of multiple frames and maintained in storage at nodal concentration centers.
** 1981, John J. McKetta Jr, Encyclopedia of Chemical Processing and Design:The zeolite may be preexchanged to the desired metal form and calcined to lock the exchangeable, metal ions into position before compositing with the other ingredients.
** 1998, Barbara S. Larsen, Charles N. McEwen, Mass Spectrometry of Biological Materials, →ISBN, page 380:The protein ligand is unfolded in denaturant in which all labile hydrogen atoms are preexchanged for deuterium and added to a D2O solution containing GroEL (method described in detail in ref. 28).