相あい互たがいにあいたがいにMeanings1adverbmutually; reciprocally; with each otherrare termRare synonym of 互いに (たがいに). Used in the same way to express mutual or reciprocal action, but たがいに is overwhelmingly more common.See also: 互いに (たがいに)彼かれらはあいたがいに助たすけ合あった。They helped each other mutually.