Uni
Done by all people
Universal
A long speech by one actor
Monologue
dull or tedious
Monotonous
A running sports event
Triathalon
Make or become united
Unify
A continuing sound
Monotone
a 3-sided plane of figure
Triangle
Relate to
Binary
Relating to
Unilateral
Exclusive possesion or control of supply of trade
Monopoly
Trilogy
Done or produced
Bimonthly
Monorail
a 3 legged stand for a camera
Tripod
divide into two
Bisect
speaking 1 language
Monolingual
a dinosaur that consists of 3 horns
Triceratops