Presignal

adj, noun

Definitions

Adjective
  1. 1
    Before a signal. not-comparable

    "Another experiment showed that presignal information about which of two frequencies was to be presented aids detection considerably, but such information does not entirely eliminate the decrement."

Noun
  1. 1
    A signal that occurs before some occurrence, as a warning or to trigger an automatic preparation.

    "A presignal gets the moving cars back of the intersection off to the same flying start as the stopped lead vehicles. Von Stein has also used presignals in Dusseldorf and in other parts of Germany to create "time islands" for streetcars that must stop where there is no room for loading islands."

Etymology

Etymology 1

From pre- + signal.

Etymology 2

From pre- + signal.

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