noun
long-standing ambition; heart's desire
A somewhat literary noun for a deeply held, long-cherished goal or aspiration. Not used in casual conversation; more common in formal writing or elevated speech.
彼は若い頃からの素志を遂げて、医者になった。
He fulfilled his long-standing ambition from his youth and became a doctor.
素志を貫くために、彼女は多くの困難を乗り越えた。
To stay true to her heart's desire, she overcame many difficulties.