improvement-n; 2 Senses

Sense Number 1: act of improving

Commentary: IMPROVEMENT[+event] the act of improving something

Examples:
Their improvements increased the value of the property.
The improvements took place in July.

Mappings:
PropBank: improvement.01
WordNet 2.0 Sense Numbers: 1

Sense Number 2: the change

Commentary: betterment, advance, melioration - a condition superior to an earlier condition

Examples:
The new school represents a great improvement.
The improvements on the house were beautiful.

Mappings:
PropBank: improvement.01
WordNet 2.0 Sense Numbers: 2 3