1"Each other" or "one another" — expressing a mutual relationship between two or more people or things; nearly synonymous with the more common お互い.
二人は互いに助け合いながら困難を乗り越えた。
The two of them overcame the hardship by helping each other.
意見が違っても、互いの立場を理解することが大切だ。
Even when opinions differ, it's important to understand each other's positions.
契約書には互いの権利と義務が明記されている。
The contract clearly states the rights and obligations of both parties.