Count On
Explorer
Three
"Three" in different languages
French  German  Russian  Welsh  Latin  Greek 

trois  drei  tri  tri  tres  treis 
Words that begin with tri or ter are often related to the number 3.

A tricycle is a bicycle (meaning literally "twowheeled") with 3 wheels.
 A trio is a (musical) group of 3 people.
 A triangle has ....?
 A mother who has just given birth to triplets has 3 babies.
 A film that is part of a trilogy is one of three.
 A triennial event happens once every 3 years.
 A trident is a 3pronged fork.
 A triathlon is a competition with 3 events.
 A tercentenary is the 300^{th} anniversary.
 Tertiary follows after primary and secondary.
Other words beginning with tri have less obvious meanings:
 Trivial comes from the latin tri for 3 and via for path or way, meaning threeways. It was at a crossroads that people would meet and talk about "trivial" things;
 Trigonometry: the greek for triangle is trigonom and the metry part means to measure. So trigonometry is about measuring triangles (finding the sizes of angles given the lengths of the sides, for example).
Can you...
 ... find some more words beginning with tri that are to do with 3?
 ... find some words that begin with tri that are not to do with 3? Perhaps this is a trick question but a trip to your dictionary will help. Maybe you've tried hard already but a friend can solve it in a trice?
 ... find a word beginning with ter that does not have anything to do with 3?