voluntary

The term voluntary refers to actions or decisions made by one's own free will, without any obligation or coercion. It describes phenomena that are optional or discretionary, where individuals have the choice to participate or not. The origin of the word comes from Latin, where 'voluntas' means 'will' or 'wish', highlighting its inherent connection to personal choice.

• Voluntary contributions to the charity helped fund the community center. — 慈善団体への自発的な寄付が地域センターの資金を助けました。
• Many voluntary organizations rely on the goodwill of volunteers to operate effectively. — 多くの団体は、効果的に運営されるためにボランティアの善意に依存しています。