世紀|せいきseiki[1]atamadaka (head-high)
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- nouncentury
- nounera
- no-adjectiveof the century (e.g. fight of the century)
- SynonymセンチュリーNeutralA loanword meaning century or 100 years, mostly seen in names; in everyday speech, 「世紀」 is what you say.
- Related時代じだいNeutralA historical period defined by a shared feature, e.g. 「江戸時代」, of any length; 「世紀」 is fixed at 100 years and also has the hyperbolic pattern 「世紀の〜」.
- Related年代ねんだいNeutralA period measured in units such as decades, e.g. 「1980年代」; it can also mean a year or date. 「世紀」 works in 100-year units.
Use 「世紀」 for periods measured in 100-year units, and for hyperbole like 「世紀の大発見」. For periods divided by number of years use 「年代」; for those defined by a characteristic, use 「時代」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


