A portal as a connection between to two points that are not contiguous in normal space is a concept exclusive to science fiction.
Actually, the concept of a portal as a connection between non-contiguous spaces existed in Ancient Near East mythology, and more recently, the term has existed in Christian practice in at least two ways. One is the grave as the portal to the next life. The other is the idea of a portal between earth and heaven that opens during prayer and/or worship.
"Irrigation of the land with sewater desalinated by fusion power is ancient. It's called 'rain'." -- Michael McClary, in alt.fusion