Compounds of 一段活用

• 一段活用
  (n) conjugation (inflection, declension) of ichidan verbs
• 下一段活用
  (n) conjugation (inflection, declension) of ichidan verbs ending in "eru"
• 上一段活用
  (n) conjugation (inflection, declension) of ichidan verbs ending in "iru"