Monomemory refers to a system where all members' memories are stored as one continuous stream of events and in one point of view. This is opposed to memories being remembered differently, separately, or only by individual members.
Monomemory exists in a venn-diagram with the term "monoconscious", but refers specifically to memories and may be used additionally or instead of that term.
Our experiences (some might not be universal):
Our system's memories seem on the surface like "one person's" memories, but they actually come from the actions of various different members. We don't have separate members forming memories simultaneously-- only one member is creating/storing memories at any point in time. After months have passed it can be hard for us to remember which member was fronting in a memory because of a lack of clear differentiation. Memories are always in first-person point of view no matter who is recalling them.