Adverb (fukushi)
in short; in brief; to sum up; ultimately; in the end; in the long run; when all is said and done; what it all comes down to; when you get right down to it
Usually written using kana alonesee つまり
つまるところ想像力だろう。After all, it might be imagination.
Also written 詰まる所【つまるところ】