[ri-surch, ree-surch]
diligent and systematic inquiry or investigation into a subject in order to discover or revise facts, theories, applications, etc.: recent research in medicine.
a particular instance or piece of research.
verb (used without object)
to make researches; investigate carefully.
verb (used with object)
to make an extensive investigation into: to research a matter thoroughly.

1570–80; (v.) < Middle French recercher to seek, Old French, equivalent to re- re- + cercher to search; (noun) < Middle French recerche

researchable, adjective
researcher, researchist, noun
proresearch, adjective
underresearch, verb (used with object)

re-search, research.

1. scrutiny, study. See investigation. 4. study, inquire, examine, scrutinize. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
research (rɪˈsɜːtʃ, ˈriːsɜːtʃ)
1.  systematic investigation to establish facts or principles or to collect information on a subject
2.  to carry out investigations into (a subject, problem, etc)
[C16: from Old French recercher to seek, search again, from re- + cercher to search]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1577, "act of searching closely," from M.Fr. recerche (1539), from O.Fr. recercher "seek out, search closely," from re-, intensive prefix, + cercher "to seek for" (see search). Meaning "scientific inquiry" is first attested 1639. Phrase research and development is recorded from 1923.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They controlled who got the money and any researcher wanting to do physical
  research was turned down.
Then find out how you can play field researcher on one of our ten volunteer
  research vacations.
For each, we've chosen a researcher or research team whose work and vision is
  driving the field.
The irony is, of course, that it was not the researcher who was trapped in an
  inefficient past but the managers.
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