词根词缀：-enni-, -ennial, -ennium

【来源及含义】Latin: year, years

【同源单词】aere perennius, amillennialism, annual, biannual, bicentennial, biennia

词根词缀：novem-

【来源及含义】Latin: nine; a number used as a prefix

【同源单词】November, novemdecillion, novena, novennial