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baker's dozen

thirteen

bicentennial

the 200th anniversary (or the celebration of it)

brace

two items of the same kind

centenarian

someone who is at least 100 years old

centennial

the 100th anniversary (or the celebration of it)

decade

a period of 10 years

decathlon

a track and field contest consisting of ten different events

decimate

destroy ten percent or more or a large portion of

dichotomy

division into two parts

fathom

a measure of water depth equaling six feet

fortnight

a period of fourteen consecutive days

millennium

the 1000th anniversary (or the celebration of it); a span of 1000 years

nonagenarian

person in his or her nineties

octogenarian

person in his or her eighties

pentagon

a plane figure with 5 sides and 5 angles

plurality

victor's margin over the runner-up when no candidate has a majority of the votes

quadrennial

occurring or being done every four years

quadruped

four-footed animal

score

group of twenty; twenty

septuagenarian

person in his or her seventies

sesquicentennial

150th anniversary

sexagenarian

person in his or her sixties

tercentennial

300th anniversary

tithe

one-tenth; tenth part of a person's income paid as a contribution or tax to support a religious establishment

treble

multiply by three; triple

triumvirate

ruling body of three; troika

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