B1
the study of a subject in detail to find information or to gain a better understanding of it
Dictionary examples:
His research on excuses for being late is very creative. (0.0)
His research on why pizza tastes better cold is ongoing. (0.0)
Her research on the perfect selfie angle took thousands of photos. (0.0)
I like doing research. (11.4)
a research center (14.1)
I've done some research on the best beaches to visit. (15.9)
scientific/medical research (27.3)
research on language development (28.9)