This is the 368th most frequent Japanese word.
つまり
"In other words," "that is to say," or "in short."
In this sentence, "つまり" is used to rephrase or clarify the preceding statement, summarizing it concisely.
彼は昨日、一晩中勉強していた。つまり、試験の準備をしていたのだ。
He was studying all night yesterday. In other words, he was preparing for his exam.
Here, "つまり" helps introduce a conclusion or the gist of the statement being made.
つまり、何が言いたいかというと、その計画には多くの課題があるということです。
In short, what I mean is that the plan has many issues.
In this example, "つまり" conveys the end conclusion or summary of the explanation, effectively signaling the outcome of an elaboration.