Translation guide
The English word 'reciprocal' describes a mutual or two-way relationship, action, or feeling. In Japanese, this concept is expressed through specific nouns, adjectives, verbs, and grammatical patterns that emphasize mutual exchange or interdependence.
Describing an action, feeling, or relationship that is done or felt by both sides equally.
A noun meaning 'mutual' or 'reciprocal', often used in formal or technical contexts. Can be combined with other words.
相互理解が大切です。
Mutual understanding is important.
相互利益のために協力しましょう。
Let's cooperate for mutual benefit.
A phrase meaning 'each other's', used to describe reciprocal possession or relationship. More common in everyday speech than 相互.
互いの意見を尊重しよう。
Let's respect each other's opinions.
互いの文化を学ぶことは楽しい。
Learning about each other's cultures is enjoyable.
A slightly more polite or friendly version of 互い, meaning 'each other'. Often used in set phrases like お互い様 (we are in the same boat).
お互い頑張りましょう。
Let's both do our best.
お互い様ですから、気にしないでください。
We're in the same boat, so don't worry about it.
Literally 'two-way', used for reciprocal communication, traffic, or data flow. Technical or business contexts.
双方向のコミュニケーションが重要です。
Two-way communication is important.
Using verb conjugations or auxiliary verbs to indicate that an action is done mutually.
Attach to the stem of a verb to mean 'do something to each other'. Very common and natural.
助け合うことが大切です。
Helping each other is important.
彼らは愛し合っている。
They love each other.
The same as 〜合う but explicitly showing the verb stem. Used for clarity or with certain verbs.
話し合いましょう。
Let's talk it over (discuss mutually).
Expressing 'each other' or 'one another' as a standalone word.
Adverbial form meaning 'mutually' or 'reciprocally'. Used with verbs.
お互いに助け合いましょう。
Let's help each other.
お互いにプレゼントを交換した。
We exchanged presents with each other.
Slightly more formal or written version of お互いに.
The mathematical reciprocal (1 divided by the number).
The mathematical term for reciprocal. Used in arithmetic and algebra.
2の逆数は1/2です。
The reciprocal of 2 is 1/2.
相互 is formal and often used in compounds (相互理解, 相互作用). 互い is more casual and used in everyday phrases. お互い adds politeness and is common in set expressions like お互い様.
〜合う is the most natural way to express reciprocal actions in Japanese. It can be attached to many verbs: 話し合う (discuss), 助け合う (help each other), 愛し合う (love each other). Avoid literal translations like 'reciprocal help'.
互いに信頼することが必要だ。
It is necessary to trust each other.