adverb, noun
one mind; united purpose
Refers to people sharing one heart, mind, or purpose. Often appears in patterns such as 一心となって, meaning acting together as one.
村人たちは一心となって復興に取り組んだ。
The villagers worked together as one on the reconstruction.
adverb, noun
wholeheartedness; one's whole heart
Used for doing something with one's whole attention or heart. The adverbial form 一心に is especially common with verbs such as 祈る, 勉強する, and 働く.
See also: 一心に
彼女は合格を願って一心に勉強した。
She studied wholeheartedly, hoping to pass.
母は子どもの無事を一心に祈った。
The mother prayed with all her heart for her child's safety.