paraphrasing/summing up the word definition

Hi, the Naver.co.kr website has an online dictionary and I have pasted the entries of the word "study" nouns, both uncountable and countable nouns.

They are:

2. N-UNjavascript:flink("COUNT") : aljavascript:flink("so") N javascript:flink("in") pl
javascript:flink("Study") javascript:flink("is") javascript:flink("the") activjavascript:flink("it")y javascript:flink("of") javascript:flink("study")javascript:flink("in")g.
javascript:flink("the") javascript:flink("use") javascript:flink("of") javascript:flink("map")s javascript:flink("and") javascript:flink("visual") javascript:flink("evidence") javascript:flink("in") javascript:flink("the") javascript:flink("study") javascript:flink("of") javascript:flink("local") javascript:flink("history").
javascript:flink("She") javascript:flink("gave") javascript:flink("up") javascript:flink("her") javascript:flink("stud")ies javascript:flink("to") javascript:flink("have") Aljavascript:flink("ex")javascript:flink("and")javascript:flink("er").

3. N-javascript:flink("COUNT") : javascript:flink("us")u javascript:flink("with") javascript:flink("sup")p
A javascript:flink("study") javascript:flink("of") a javascript:flink("subject") javascript:flink("is") a javascript:flink("piece") javascript:flink("of") javascript:flink("research") javascript:flink("on") javascript:flink("it").
javascript:flink("Recent") javascript:flink("stud")ies javascript:flink("suggest") javascript:flink("that") javascript:flink("as") javascript:flink("many") javascript:flink("as") 5 javascript:flink("in") 1000 javascript:flink("new") javascript:flink("mother")s javascript:flink("are") javascript:flink("likely") javascript:flink("to") javascript:flink("have") javascript:flink("this") javascript:flink("problem").

4. N-javascript:flink("PLURAL") : javascript:flink("sup")p N
javascript:flink("You") javascript:flink("can") javascript:flink("refer") javascript:flink("to") javascript:flink("educational") javascript:flink("subject")s javascript:flink("or") javascript:flink("course")s javascript:flink("that") javascript:flink("contain") javascript:flink("several") javascript:flink("element")s javascript:flink("as") javascript:flink("stud")ies javascript:flink("of") a javascript:flink("particular") javascript:flink("kind").
a javascript:flink("new") javascript:flink("centre") javascript:flink("for") javascript:flink("Is")javascript:flink("lam")ic javascript:flink("stud")ies.
javascript:flink("She") javascript:flink("is") javascript:flink("current")ly javascript:flink("do")javascript:flink("in")g a javascript:flink("business") javascript:flink("stud")ies javascript:flink("course") javascript:flink("at") javascript:flink("Lee")ds.

7. N-javascript:flink("COUNT")
A javascript:flink("study") javascript:flink("by") javascript:flink("an") javascript:flink("artist") javascript:flink("is") a javascript:flink("drawing") javascript:flink("which") javascript:flink("is") javascript:flink("done") javascript:flink("in") javascript:flink("preparation") javascript:flink("for") a javascript:flink("large")r javascript:flink("picture").

8. N-javascript:flink("COUNT")
A javascript:flink("study") javascript:flink("is") a javascript:flink("room") javascript:flink("in") a javascript:flink("house") javascript:flink("which") javascript:flink("is") javascript:flink("used") javascript:flink("for") javascript:flink("reading"), javascript:flink("writing"), javascript:flink("and") javascript:flink("study")javascript:flink("in")g.

If I want to summarize the definition in my writing, can I do this? Please let me know if the definite article "the" is the only option available and the indefinite article "a" is not among viable/avaiable choices/options. I think it is so due to the use of the word in an uncountable sense in no 1.

According to Korea Naver online dictionary, I think the definitions for the word "study" in noun form can summed up as b 1) the activity of studying, 2) a piece of reseach on a subject of it, 3) as a plural noun, to mean educational subjects or courses that contain several elements, 4) a drawing which is done is preparation for a larger picture by an artist, and 5) a room in a house which is used for reading, writing, and studying.