Meaning : (comparative of `little' usually used with mass nouns) a quantifier meaning not as great in amount or degree.
Example :
Of less importance.
Less time to spend with the family.
A shower uses less water.
Less than three years old.
Meaning : (usually preceded by `no') lower in quality.
Example :
No less than perfect.
Meaning : (nonstandard in some uses but often idiomatic with measure phrases) fewer.
Example :
Less than three weeks.
No less than 50 people attended.
In 25 words or less.
Meaning : Used to form the comparative of some adjectives and adverbs.
Example :
Less interesting.
Less expensive.
Less quickly.
Synonyms : to a lesser extent
Used to form the comparative of some adjectives and adverbs.
More interesting.Meaning : Comparative of little.
Example :
She walks less than she should.
He works less these days.
Comparative of much. To a greater degree or extent.
He works more now.