年代|ねんだいnendai[0]heiban (flat)

1. nounage; era; period; date
   １９９０年ねん代だいは湾岸わんがん戦争せんそうで始はじまった。↗

   The 1990s began with the Gulf War.

• Synonym時代じだいNeutralCovers historical eras and periods broadly, as in 「江戸時代」; 「年代」 zeroes in on divisions by year, as in 「九十年代」.
• Synonym時期じきNeutralA stretch of time, short or long, as in 「この時期」, and also the right moment for doing something; 「年代」 is an era divided by years.
• Synonym時世じせいNeutralPoints to the way of the world at a given time, often as 「ご時世」; 「年代」 is simply a time span divided by years, with no sense of social climate.
• SynonymエポックNeutralA loanword for an era or a new epoch, also seen in 「エポックメイキング」 (epoch-making); for everyday year-based divisions use 「年代」.
• Related期間きかんNeutralMeans the span between a start and an end, as in 「有効期間」, and never denotes an era; 「年代」 is an era divided by years.
• Related世紀せいきNeutralCounts centuries in 100-year units, as in 「21世紀」; 「年代」 typically works in ten-year units, as in 「80年代」.
• Related年月としつきNeutralSpeaks of long years passing or piling up, as in 「長い年月が経つ」, stressing the flow of time; 「年代」 is a unit for dividing time.
• Related月日つきひNeutralMeans the days and months, with a literary flavor, as in 「月日の経つのは早い」; 「年代」 divides concrete eras.
• Related期きNeutralMostly a suffix meaning period or term, as in 「第1期」 and 「思春期」; 「年代」 stands alone for an era divided by years.

Use 「年代」 for eras divided by years, as in 「80年代」. For historical eras choose 「時代」, for a stretch of time 「時期」 or 「期間」, and for a century 「世紀」. 「時世」 adds a sense of the times, 「年月」 and 「月日」 speak of passing years, 「期」 is mostly a suffix, and 「エポック」 is a loanword for a new epoch.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 時間じかんを年ねん単位たんいの尺度しゃくどで分別ぶんべつした期間きかん、時代じだい。
2. 年ねん単位たんいに意識いしきされる時期じき。
3. 10又または100の倍数ばいすうの西暦せいれき又または和暦われき等とうに付ふして、そこから概おおむね10年間ねんかん又または100年間ねんかんの期間きかんを表あらわし、その期間きかんに共通きょうつうする特徴とくちょう等とうを述のべるのに用もちいる。