a laboratory

research association; research society / group of enthusiasts (as may be found in schools, colleges, etc)

(education) research project, done by Japanese schoolchildren during summer break, to be presented upon return to school

research & development; R&D

researcher

a research student (i.e. a visiting or non-matriculating graduate student) / a researcher

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

revisionism

"Historical kana usage", a prescriptive method of using kana to write Japanese. Devised in the Edo period by Keichū (契沖) and taught in schools until 1946, it aims to be etymologically faithful and reflects earlier stages of the language (Heian period and earlier).

experimental study