WORD ROOTS: ANN, ENN
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millennium
the 1000th anniversary (or the celebration of it)
anniversary
the date on which an event occurred in some previous year (or the celebration of it)
superannuated
too old to be useful
semiannual
twice a year
annual
yearly
annals
historical records
perennial
lasting for a long time
centennial
n. A 100th anniversary or its celebration
biannual
occurring twice a year
annuity
payment received every year
