UN declaration of human rights
Article 17
Definition
Everyone has the right to own property alone as well as in association with others.
No one shall be arbitrarily deprived of his property.
My definition :
Everyone has the right to own things. No one has the right to take them from you without asking or having a good reason to take it from you.
Scenario where this right may be breached:
When someone takes your wallet without asking and they spend your money.