1 PIECE OF WORK (C) a piece of work that is done to find out more about a particular subject or problem, and usually includes a written report(+ of/into): We're doing a study into how much time people spend watching television. | a study of Australian wild birds | make/carry out/conduct a study: a study of children's eating habits carried out in 19762 ROOM (C) a room in a house that is used for work or study3 SCHOOL WORK (U) the activity of studying: Set aside a period of time specifically for study.4 studies (plural) subjects that people study, especially several related subjects: the Department of Russian Studies5 ART (C) a small detailed drawing, especially one that is done to prepare for a large painting: Renoir's studies of small plants and flowers6 MUSIC (C) a piece of music, usually for piano, that is often intended for practice7 be a study in sth to be a perfect example of something: His face was a study in incredulity.8 be in a brown study old-fashioned to be thinking deeply about something2 studied, studying verb1 (I, T) to spend time reading, going to classes etc in order to learn about a subject: I've been studying English for 6 years. | I can't study with that music playing all the time. | study to be a doctor/lawyer etc: My brother's studying to be an accountant. | study for an exam/diploma etc: I've only got three weeks left to study for my exams. | study under sb (=be trained by a famous teacher): a psychologist who studied under Jung in Zurich—see know 12 (T) to watch and examine something carefully over a period of time in order to find out more about it: Goodall was studying the behavior of gorillas in the wild. | study how/why/when etc: studying how stress affects body chemistry3 (T) to spend a lot of time carefully examining a plan, document, problem etc: I haven't had time to study the proposals yet.
Longman dictionary of contemporary English. 2004.