Contingent liabilities definition

You asked

In the paper on state and public sector pensions, the ONS used the phrase "contingent liabilities".

Dictionaries define contingent as

1. dependent for existence, occurrence, character, etc., on something not yet certain; conditional (often followed by on or upon):
   Our plans are contingent on the weather.

2. liable to happen or not; uncertain; possible:
   They had to plan for contingent expenses.

3. happening by chance or without known cause; fortuitous; accidental:
   contingent occurrences.

Which of the three meanings is the one intended by the ONS?

We said

Thank you for your request.

The definition for 'contingent liabilities' in relation to state pensions can be found in response to the following Freedom of Information request:

https://www.ons.gov.uk/aboutus/transparencyandgovernance/freedomofinformationfoi/contingentliabilities