Final answer:
The term synonymous with 'universe' in the context of a domain or province is 'world'.
Step-by-step explanation:
In the context of a domain or province, the term synonymous with 'universe' is world (option b).
For example, if we are discussing the literary universe, we might refer to the world of a specific novel or the world of a particular author's works. In this sense, 'world' represents the entire scope or range of something.
Other options provided in the question, such as 'in unison', 'combining', and 'integrity', do not convey the same meaning as 'universe' in this specific context.