You will be able to use the clues from context and links provided in this blog post, but NOT the dictionary or dictionary.com.
Answer these questions in a comment below. Don't forget to "sign" your comment with your first name.
1. What does commemorate mean?
2. Why do you believe glass is often used to commemorate a special event?
3. Use commemorate/commemorative in a sentence that shows you know the meaning of the word.
Next, click on these commemorative pieces on eBay that people are selling. Read to see how much they are and what they are commemorating.