Propriety (noun)

1. The quality of being appropriate, suitable, or fitting; the state of being correct or in accordance with convention, good manners, or tradition.
2. The state of being one's own; ownership.

Origin:

From latin proprietatem, from proprius "one"s own, proper".

Examples:

1. He spoke with propriety in the meeting and earned the respect of his colleagues.
2. She was always concerned about propriety and never did anything that might be considered improper.
3. It is a question of propriety whether to invite him to the party.
4. The propriety of the land was transferred from the father to the son.
5. The propriety of the school uniform was questioned by some of the parents.