C
anniversary
annual holiday
bicentenary
bicentennial
biennial
birthday
bissextile day
cental
centare
centenarian
centenary
centennial
centennium
centigram
centimeter
centipede
centistere
centred
centref
centrev
centumvir
centumvirate
centurion
century
commemoration
cwt
decennial
diamond jubilee
golden wedding anniversary
gross
hecatomb
holy days
hundred
hundredweight
immovable feast
jubilee
leap year
long hundred
name day
natal day
octennial
one C
quadrennial
quasquicentennial
quincentenary
quincentennial
quinquennial
septennial
sesquicentenary
day of remembrance
tercentennial
Fourth of July
Llewellyn
Passover
Yule
bimonthly
byintelligence
death-day
extra-special
nbc-related
nih-supported
non-classified
online/offline
peekaboo
postgame
pre-christmas
thenba
welcome-home