exclusion-n; 3 Senses

Sense Number 1: a state of intentional exclusion

Commentary: EXCLUSION[+state][+omission][+intentional]

It's an important principle of exclusion in physics stating that no two particles may have the same set of quantum numbers.
The exclusion of salt from this bread makes it taste too bland.
The slaves' exclusion from the rights of citizens lasted more than 100 years.

WordNet 3.0 Sense Numbers: 1, 2

Sense Number 2: the act of intentionally omitting something

Commentary: EXCLUSION[+event][+action][+omission][+intentional]
NOTE: implies an agent who makes the omission

Mary's exclusion of John from the planning meeting angered him.
The military's exclusion of drug users is a long-standing policy.
You don't have to focus on this issue to the exclusion of all others.

WordNet 3.0 Sense Numbers: 3, 4

Sense Number 3: a circumstance, condition, risk not covered by a contract or policy

Commentary: EXCLUSION[+entity][+symbolic][+content][+circumstance][-covered][+by_contract]

If you add these exclusions to your insurance policy, your rates will be lower.
One exclusion on the policy is flooding.

WordNet 0.0 Sense Numbers: 1b