• 完了かんりょう — completion
• 完全かんぜん — perfection
• 完結かんけつ — conclusion
• 完備かんび — fully equipped
• 未完みかん — unfinished
• 完走かんそう — finishing a race

The character 完 consists of the radical 宀 (“roof”) and the component 元 (“origin” or “base”), suggesting something being safely and completely enclosed. It conveys the idea of something whole and without defect — “perfect” or “complete.”

宿題しゅくだいを 完了かんりょうしました。
I finished my homework.

この 計画けいかくは 完全かんぜんに 実行じっこうされた。
This plan was carried out perfectly.

🎧 This character is primarily read as カン (kan) in on-yomi. While there’s no common kun-yomi, it appears in many compound words involving “completion” or “wholeness.”