This is the 576th most frequent Japanese word.
解決
Solution; resolution.
In this example, '解決' (kaiketsu) is used as a noun to denote the act or process of resolving something.
その問題の解決には時間がかかるでしょう。
It will probably take time to resolve the issue.
In this sentence, '解決' (kaiketsu) means 'solution' or 'resolution,' and it is used as part of the compound word '解決策' (solution strategy).
その問題の解決策を提案しました。
I proposed a solution to that problem.
Here, '解決' (kaiketsu) functions as a verb meaning 'to resolve' or 'to solve' when combined with the verb 'する' (to do).