- The definition of lessen is to diminish or to cause something to be diminished or reduced.
When you take pain pills and they reduce pain, this is an example of a situation where the pills lessen the pain.
lessen definition by Webster's New World
- to make less; decrease
- Archaic to belittle; minimize; disparage
lessen definition by American Heritage Dictionary
verb less·ened, less·en·ing, less·ens verb, transitive
- To make less; reduce.
- Archaic To make little of; belittle.
Origin: Middle English lessen, lessenen, from lesse, less; see less .