In the context of employment law, if a certain practice or benefit has become implied into the employment contract through regular informal usage, it can amount to an implied term of the contract even if not explicitly recognised or recorded in a contract of employment.

For example, it may have become common practice over a period of time for employees to leave early on a Friday, have a half day on Christmas Eve or other Bank Holidays etc. In order for this to become an entitlement established by custom and practice, it must usually be consistent, automatically received, expected, long-standing and well-known through the company.