a long speech by one person/character
monologue
speaking two languages
bilingual
a three-part race with swimming, cycling, and running
triathlon
shape with six sides
hexagon
shape with nine sides
nonagon
boring because it's always the same
monotonous
twice a year
biannual
series of three books or movies
trilogy
happens every seven years
septennial
10 years
decade
by yourself because you want to be
solitude
piece of music by two performers
duet
a spear with three points
trident
someone in their 70s
septuagenarian
100 years
century
to bring people together
unify
both hands are equally strong
ambidextrous
four musicians playing together
quartet
octagon
100 year anniversary
centennial
having to do with the Sun
solar
having more than one meaning
ambiguous
shape with five sides
pentagon
someone in their 80s
octogenarian
officer in the Roman army
centurion