Definitions for "Minibuffer"
Keywords:  emacs, argument, echo, buffer, commands
a one-line buffer at the bottom of the screen, where you type in things like filenames and search expressions
a special buffer that Emacs commands use to read arguments more complicated than the single numeric prefix argument
The minibuffer is the window that appears when necessary inside the echo area (q.v.), used for reading arguments to commands. See section E. The Minibuffer.