What does 活動 mean?
活動 is a Japanese noun meaning “action, activity” in English. It can also be translated as “moving picture” depending on context. It is written as 活動 in kanji, かつどう in hiragana, and katsudou in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
テレビを見ることは受動的活動である。
Watching TV is a passive activity.