adverb
mutually; reciprocally; together
Archaic or literary adverb meaning 'mutually' or 'with each other'. In modern Japanese, 互いに (たがいに) is the standard equivalent. This form may appear in classical literature or formal older writing.
古い手紙には「互に助け合う」と書かれていた。
In the old letter, it was written 'help each other mutually'.
互に敬うことが大
My grandfather often said that it is important to respect each other mutually.