Liminal

Adjective

1. Of or pertaining to an entrance or threshold. .mw-parser-output .defdate{font-size:smaller}
2. Pertaining to or in a state that is in-between or transitional between two (or more) other states, while belonging to neither; pertaining to or in a state such as to be neither definitively in a particular other state or category nor definitively outside it.
3. Of or pertaining to a beginning or first stage of a process.