infall

infall

(ˈɪnˌfɔːl)
n
1. (Military) an attack upon or incursion into; invasion
2. (Physical Geography) the place where a path or stream meets another; junction
3. (Physical Geography) the falling of a stream of water into a body of water
4. (Astronomy) astronomy the falling of matter to a celestial body from space under the influence of the body's gravity
5. (Astronomy) astronomy the matter which thus falls to a celestial body