1. verb /ˈstʌdi/
a) To revise materials already learned in order to make sure one does not forget them, usually in preparation for an examination.
Students are expected to start studying for final exams in March.
b) To take a course or courses on a subject.
I need to study my biology notes.
2. noun /ˈstʌdi/
a) Thought, as directed to a specific purpose; ones concern.
Thenne the kyng sat in a study and bad his men fetche his hors as faste as euer they myghte.
b) Mental effort to acquire knowledge or learning.
My study was to avoid disturbing her.
Wikipedia foundation.