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：quinqu-, quinqua-, quinque-

【来源及含义】Latin: five, fifth; a word element for number 5

【同源单词】quinquagenarian, quinquagenary, Quinquagesima, quinquagesimal, quinquangular, quinquefarious