Collision

In telecommunication, the term collision has the following meanings:

1. In a data transmission system, the situation that occurs when two or more demands are made simultaneously on equipment that can handle only one at any given instant.

2. In a computer, the situation that occurs when an attempt is made to store simultaneously two different data items at a given address that can hold only one of the items.

Source: from Federal Standard 1037C and from MIL-STD-188