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When you have been with a guy/girl long enough that you know you are going to marry him/her but have not proposed yet. More than a boyfriend/girlfriend, but still not a fiancee`.
Your pre-ancee`.

Pronounced like fiancee`, but with pre-, as in coming before, as a prefix.
"Mom, Dad, this is Ashley, my pre-ancee`."
by Mayor Maynot October 19, 2012