WordReference Random House Learner's Dictionary of American English © 2017
re•search /rɪˈsɜrtʃ, ˈrisɜrtʃ/USA pronunciation   n. 
  1. [uncountable] careful patient study of a subject in order to discover or revise facts, theories, principles, etc.
  2. []
  3. [countable]a particular piece of research.

  1. to investigate or look into something carefully* to do research on: [+ object]He researched the subject.[no object]spending time researching.
re•search•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2017
re-search  (rē sûrch),USA pronunciation v.t., v.i. 
  1. to search or search for again.
  • re- + search 1740–50

re•search  (ri sûrch, rēsûrch),USA pronunciation n. 
  1. diligent and systematic inquiry or investigation into a subject in order to discover or revise facts, theories, applications, etc.:recent research in medicine.
  2. a particular instance or piece of research.

  1. to make researches;
    investigate carefully.

  1. to make an extensive investigation into:to research a matter thoroughly.
re•searcha•ble, adj. 
re•searcher, re•searchist, n. 
  • Middle French recerche
  • Middle French recercher to seek, Old French, equivalent. to re- re- + cercher to search; (noun, nominal)
  • (verb, verbal) 1570–80
    • 1.See corresponding entry in Unabridged scrutiny, study. See  investigation. 
    • 4.See corresponding entry in Unabridged study, inquire, examine, scrutinize.

Collins Concise English Dictionary © HarperCollins Publishers::

research /rɪˈsɜːtʃ; ˈriːsɜːtʃ/ n
  1. systematic investigation to establish facts or principles or to collect information on a subject
  1. to carry out investigations into (a subject, problem, etc)
Etymology: 16th Century: from Old French recercher to seek, search again, from re- + cercher to search

reˈsearchable adj reˈsearcher n

'research' also found in these entries:
Collocations: research the [topic, issue, subject, market, war, ruins], [market, medical, nano, educational] research, a research [guide, project, method, facility, foundation, team], more...

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