What does 互い mean?
互い is a Japanese noun meaning “mutual, each other” in English. It is written as 互い in kanji, たがい in hiragana, and tagai in romaji. This word is part of JLPT N3 vocabulary.
Example sentence
結婚は２人が互いを理解し合えばすばらしいものとなりうる。
Marriage can be a wonderful thing if two people understand each other.