noun
proviso
pruh-VIE-zoh/prəˈvaɪzəʊ/
A condition attached to an agreement.
The agreement includes the proviso that the work proceeds only if paid.

Etymology
“Seeing ahead” underlies the sense of making provision. The legal formula “it being provided that” introduced a condition, and its opening word became the name for the condition itself.
In context
… so long as it is at their own risk and peril this last proviso is of course indispensable …
More examples
- You may borrow my car with the proviso that you return it tonight.
- The lease includes a proviso requiring written permission for pets.
- Both sides agree to remove the extra provisos before signing.
Forms
proviso · provisos · provisoes
Similar words
- condition
- A broader term for a requirement that must be met.
- stipulation
- Emphasizes a requirement explicitly stated as part of an agreement.
- qualification
- Emphasizes a restriction that limits an agreement's scope or application.