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.
Mutual understanding is important.
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.
Let's respect each other's opinions.
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).
Let's both do our best.
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.
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.
Helping each other is important.
They love each other.
The same as 〜合う but explicitly showing the verb stem. Used for clarity or with certain verbs.
Let's talk it over (discuss mutually).
Expressing 'each other' or 'one another' as a standalone word.
The mathematical reciprocal (1 divided by the number).
The mathematical term for reciprocal. Used in arithmetic and algebra.
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'.
We exchanged presents with each other.
互いに信頼することが必要だ。
It is necessary to trust each other.