Transition constraint
A transition constraint is a way of enforcing that the data doesn't enter an impossible state because of a previous state. For example, it shouldn't be possible for a person to change from being "married" to being "single, never married". The only valid states after "married" might be "divorced", "widowed", or "deceased".
Transient constraint is commonly used in database models such as relational databases.
References
Modelling Transition Constraints (ResearchIndex)
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