study of something; the sum of knowledge accrued by scholars; the realm of refined learning; scholarship

to study, to engage in scholarship

mutual, reciprocal

a piece of research, a study, investigation

to research, to study

(sciences) natural science

world / border

boundary / a bounded area or region / a bounded group of people, a society, a world as a social grouping, such as business, celebrities, or finance / the border edge of a thing

border, boundary, limits

relationship, relation / involvement, participation / personal connection, family relationship / romantic relationship