Merriam-Webster has a list of ten word what define our decade, that is, the decade what just passed us by. I believe these words were looked up the most through the dictionaries services.

1. rogue (uncontrollable)

2. locavore (one who eats local food)

3. integrity (moral wholeness)

4. staycation (at home while out of the office)

5. partisan (I’m too angry to define it)

6. Google (search)

7. insurgent (“to rise up”)

8. bailout (see partisan)

9. Pandemic (broader than an epidemic disease)

10. Carbon footprint (farting)

By slight contrast, here’s their list of words from the 90s.