Princeton's WordNet

1. research(noun)

   systematic investigation to establish facts

2. inquiry, enquiry, research(verb)

   a search for knowledge

   "their pottery deserves more research than it has received"

3. research(verb)

   attempt to find out in a systematically and scientific manner

   "The student researched the history of that word"

4. research, search, explore(verb)

   inquire into

   "the students had to research the history of the Second World War for their history project"; "He searched for information on his relatives on the web"; "Scientists are exploring the nature of consciousness"

Kernerman English Learner's Dictionary

1. research(noun)ɪˈsɜrtʃ, ˈri sɜrtʃ

   the investigation of a particular subject in order to find information

   medical/academic/historical research; I'm doing some research into my family history.; to carry out research

2. research(verb)ɪˈsɜrtʃ, ˈri sɜrtʃ

   to investigate a subject in order to find information

   He's researching the poet's life.

Wiktionary

1. research(Noun)

   Diligent inquiry or examination to seek or revise facts, principles, theories, applications, et cetera; laborious or continued search after truth.

2. research(Noun)

   A particular instance or piece of research.

3. research(Verb)

   To search or examine with continued care; to seek diligently.

4. research(Verb)

   To make an extensive investigation into.

5. research(Verb)

   To search again.

Origin: Early Modern rechercher, from recerchier.

Webster Dictionary

1. Research(noun)

   diligent inquiry or examination in seeking facts or principles; laborious or continued search after truth; as, researches of human wisdom

2. Research(verb)

   to search or examine with continued care; to seek diligently

U.S. National Library of Medicine

1. Research

   Critical and exhaustive investigation or experimentation, having for its aim the discovery of new facts and their correct interpretation, the revision of accepted conclusions, theories, or laws in the light of newly discovered facts, or the practical application of such new or revised conclusions, theories, or laws. (Webster, 3d ed)

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