research

UK: /rɪˈsɜː^rtʃ/

US: /rɪˈsɝtʃ, ˈrisɝtʃ/

US: (ri sûrch′, rē′sûrch)

WordReference Random House Learner's Dictionary of American English © 2025

re•search /rɪˈsɜrtʃ, ˈrisɜrtʃ/   n. 

1. [uncountable] careful patient study of a subject in order to discover or revise facts, theories, principles, etc.
[]
2. [countable] a particular piece of research.

v. 

3. 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]

Collins Concise English Dictionary © HarperCollins Publishers::

research / rɪˈsɜːtʃ ˈriːsɜːtʃ/ noun

1. systematic investigation to establish facts or principles or to collect information on a subject

verb

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 adjective

reˈsearcher noun

WordReference Random House Unabridged Dictionary of American English © 2025

re-search  (rē sûrch′), v.t., v.i. 

1. to search or search for again.

• re- + search 1740–50

re•search  (ri sûrch′, rē′sûrch), 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.

v.i. 

3. to make researches;
   investigate carefully.

v.t. 

4. to make an extensive investigation into:
   to research a matter thoroughly.

• Middle French recerche
• Middle French recercher to seek, Old French, equivalent. to re- re- + cercher to search; (noun, nominal)
• (verb, verbal) 1570–80

re•search′a•ble, adj. 
re•search′er, re•search′ist, n. 
Synonyms

• 1. scrutiny, study. See investigation. 
• 4. study, inquire, examine, scrutinize.