the act of making something mandatory or compulsory (often by law or regulation).
国はワクチン接種の義務化を検討している。
The government is considering making vaccination mandatory.
新しい条例で建物の表示義務化が盛り込まれた。
The new ordinance included a provision making signage for buildings mandatory.
会社は社員の健康診断の義務化を決めた。
The company decided to make employee health checks compulsory.