Cases of word usage

1) any of a kind of small animals, such as an ant, fly, beetle, having six legs and no backbone and a body divided into three parts (insect)

2) (happening) once in each three months (quarterly)

3) a complete set of matching articles of furniture; a set of rooms (e.g. in a hotel); an orchestral composition made up of three or more related parts (suite)

4) a (long) composition in (usually) three or four parts (called 'movements') for an orchestra (symphony)

5) the part of the body between the neck and the abdomen; the middle of the three main sections of an insect (with the legs and wings) (thorax)

6) three times as much as or as many(a boy's voice with, instrument that makes) the highest part in a piece of music (treble)

7) any flat figure that has three straight sides (triangle)

8) (something) lasting for, happening or done, every three years (triennial)

9) a group of three related plays, novels etc (trilogy)

10) a group of three; (a musical composition for) a group of three singers or players (trio)