(transitive) To make less; to diminish; to reduce. / (intransitive) To become less.

(nonstandard, dialect) unless.

present participle of lessen

A growing lesser; reduction or decrease.

simple past tense and past participle of lessen

Having been lessened.

Third-person singular simple present indicative form of lessen

One who, or that which, lessens.

plural of lessener

plural of lessening