Final answer:
The nurse enters intimate space while changing a client's abdominal dressing, a term referring to very close personal proximity.
Step-by-step explanation:
When a nurse is changing a client's dressing over an abdominal wound, the level of space around the client that is entered is intimate space. This term refers to the proximity that is typically reserved for the closest personal relationships, such as those involving personal care or medical procedures. In nursing and healthcare, maintaining a professional and compassionate demeanor while in this space is crucial.