(nonstandard in some uses but often idiomatic with measure phrases) fewer; "less than three weeks"; "no less than 50 people attended"; "in 25 words or less"
(usually preceded by `no') lower in quality; "no less than perfect"
used to form the comparative of some adjectives and adverbs; "less interesting"; "less expensive"; "less quickly"
comparative of little; "she walks less than she should"; "he works less these days"
a tight feeling in some part of the body; "he felt a constriction in her chest"; "she felt an alarming tightness in her chest"; "emotion caused a constriction of his throat"
tight or narrow compression
a narrowing that reduces the flow through a channel