Translation guide
The English prefix 'bi-' means 'two' or 'twice'. In Japanese, this concept is expressed using the prefix 二 (ni) or the counter 二つ (futatsu), depending on context. For words like 'bilingual' or 'bicycle', Japanese often uses specific compound words rather than a direct prefix translation.
Expressing the idea of 'two' or 'twice' as a prefix in compound words
The prefix 二 (ni) is used in many compounds to mean 'two' or 'bi-'. It is the most direct equivalent for 'bi-' in Japanese.
bilingual speaker
二足歩行
bipedal locomotion
The prefix 両 (ryō) means 'both' or 'two' and is used in some compounds where 'bi-' might be used in English, especially when referring to two sides or mutual relationships.
Using the native Japanese counter 二つ (futatsu) as a prefix is less common but can appear in some compound words, especially in traditional or poetic contexts.
bifold
Referring to a bicycle or bike
The standard word for 'bicycle'. While not a direct translation of 'bi-', it is the most common word associated with the concept.
ride a bicycle
Often used for 'motorcycle' but can sometimes refer to a bicycle in casual speech, especially among younger people. Be aware of context.
Can be ambiguous; 自転車 is clearer for bicycle.
Referring to bisexuality
Referring to bilingualism
In Japanese, 'bi' is not a standalone word. It is always part of a compound or loanword. Do not use 'bi' alone in Japanese; it will not be understood.
For modern concepts like 'bisexual' or 'bilingual', the English loanword (e.g., バイセクシュアル, バイリンガル) is very common and often preferred in casual conversation. Native Japanese compounds (e.g., 両性愛者, 二言語話者) sound more formal or technical.
バイクで行く
go by bike (could be bicycle or motorcycle)
A more formal or clinical term for a bisexual person.
bisexual community