In telecommunication, the term delay has the following meanings:
1. The amount of time by which an event is retarded.
2. The time between the instant at which a given event occurs and the instant at which a related aspect of that event occurs.
Note 1: The events, relationships, and aspects of the entity being delayed must be precisely specified.
Note 2: Total delay may be demonstrated by the impulse response[?] of a device or system.
Note 3: In analog systems, total delay is described in terms of the transfer functions in the frequency domain[?]. Synonym delay time.
3 . In radar, the electronic delay of the start of the time base used to select a particular segment of the total.
Source: from Federal Standard 1037C and from MIL-STD-188
