Adjective

1. Made less in size or amount or degree

Verb

1. Cut down on; make a reduction in
2. Make less complex
3. Bring to humbler or weaker state or condition
4. Simplify the form of a mathematical equation of expression by substituting one term for another
5. Lower in grade or rank or force somebody into an undignified situation
6. Be the essential element
7. Reduce in size; reduce physically
8. Lessen and make more modest
9. Make smaller
10. To remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons
11. Narrow or limit
12. Put down by force or intimidation
13. Undergo meiosis
14. Reposition (a broken bone after surgery) back to its normal site
15. Destress and thus weaken a sound when pronouncing it
16. Reduce in scope while retaining essential elements
17. Be cooked until very little liquid is left
18. Cook until very little liquid is left
19. Lessen the strength or flavor of a solution or mixture
20. Take off weight