On Prop. 1.7 (a) on page 5 of Milne's Etale Cohomology book states:
Any immersion is quasi-finite.
A google search turned up definitions for "open immersion" and "closed immersion", never just "immersion".
Question: what does it mean for a morphism to be an "immersion"?
Could it be
A morphism of schemes which as a map on the topological spaces is a homeomorphism onto the image?
Short hand for either an open or a closed immersion?
Short hand for one but not the other?
Something else?