Translation guide
The English word 'era' refers to a long and distinct period of history. In Japanese, the most common equivalent is 時代 (jidai), but the specific term used depends on context, such as historical periods, imperial reign names, or geological time scales.
Referring to a distinct period in history characterized by particular events, culture, or conditions.
The most common and versatile word for 'era' or 'age'. It can be used for historical periods, cultural epochs, or personal life stages.
明治時代は日本の近代化が進んだ時代です。
The Meiji era was a period when Japan modernized.
インターネットの時代が始まった。
The internet era has begun.
Often used for decades or specific time spans, like the 1960s. Can also mean 'age' in a chronological sense.
1960年代は大きな社会変革の時代だった。
The 1960s was an era of great social change.
Refers to a period or phase, often with a focus on timing rather than a named historical era. More like 'time' or 'period'.
その時期は経済が不安定だった。
During that era, the economy was unstable.
Referring to a Japanese imperial era name (gengō) like Reiwa, Heisei, Shōwa.
The term for the Japanese era name system. Use this when talking about the era name itself.
日本の元号は令和です。
The current Japanese era name is Reiwa.
When combined with the era name, e.g., 令和時代 (Reiwa era). This is the natural way to say 'the Reiwa era'.
Referring to a major division of geological time, such as the Mesozoic Era.
Used in geological time scales for 'era', e.g., 中生代 (Mesozoic Era).
恐竜は中生代に繁栄した。
Dinosaurs flourished during the Mesozoic Era.
Can also be used in a broader sense for geological periods, but 代 is more technical.
Emphasizing the beginning of a new period, often with a sense of change.
Literally 'new era'. Commonly used for technological or social shifts.
AIの登場で新時代が到来した。
A new era has arrived with the advent of AI.
Means 'the end of an era'. Used when something significant concludes.
その店の閉店は一つの時代の終わりを感じさせた。
The closing of that shop felt like the end of an era.
English uses 'era' broadly (e.g., 'the smartphone era'). In Japanese, 時代 is natural, but sometimes a more specific word like 時期 or 年代 is better. Avoid directly translating 'era' as 時代 in every case; consider the nuance of the time span.
時代 (jidai) is the most general and common for 'era' or 'age'. 年代 (nendai) is often used for decades or specific numbered years. 時期 (jiki) is more about a phase or timing, less about a named historical period.
It's only been a few years since the Reiwa era began.
Ice ages have occurred many times.