Point Bicentennial

Help with these words???? 10 points!!!!!!?

Can you give me a definition and when some one could use it? (like talking or in their writing?) Here’s the words…
1. Quintet
2. Octet
3. Bicentennial
4. Quintessential
5. Quintessence
Answer as many as can plez thank you very much!!!!

Quintet is a group containing five members. It’s usually used for a group of musicians like a brass quintet or something.

Octet is a group of 8 musicians like above.

Bicentennial is the 200th anniversary of an event or the celebration. Like yesterday’s party was the bicentennial of their family business.

Quintessential is the pure and concentrated essence of a substance. Ex. The gold brick was the quintessential of multiple gold nuggets (not sure about this one sorry)

Quintessence is basically like Quintessence

2002 PR70 West Point Bicentennial Silver Dollar