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.
verb (used without object)
3.
to make researches; investigate carefully.
verb (used with object)
4.
to make an extensive investigation into: to research a matter thoroughly.
Origin: 1570–80; (v.) < Middle French recercher to seek, Old French, equivalent to re-re- + cercher to search; (noun) < Middle French recerche
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.