A firm decision or determination — a strong resolve to do something and see it through toward a goal.
留学する決意を固め、両親に相談した。
I made up my mind to study abroad and consulted my parents.
彼の決意は周囲の人々にも伝わった。
His determination was conveyed to the people around him.
決意を新たにして、プロジェクトに取り組み始めた。
Renewing my determination, I began working on the project.