This is the 176th most frequent Japanese word.
研究
Research; study.
Here, "研究" (research) refers to an academic or systematic study carried out in the field of science.
私は科学研究に夢中です。
I am passionate about scientific research.
"研究" here refers to the scholarly study of history to provide comprehension of earlier times.
歴史研究は過去を理解するのに役立ちます。
Historical research helps in understanding the past.
In this sentence, "研究" conveys the process of studying and developing innovations in technology.