Probability.
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It means there is virtually no chance an event will happen.
An event that will definitely happen is an event with 100% probability.
No. The probability of an event ranges from 0 (the event will not happen) to 1 (the event will happen).
Yes, the word 'probability' is a noun, a singular, common, abstract noun; a word for the chance that something will happen; something that has a chance of happening; a measure of how often a particular event will happen; a word for a concept; a word for a thing.
An event will happen or not so its probabilty is between 0 (never happen) and 1 (will surely happen). The probability is a measure of its chance to happen. A negative probability would have no sense. You can think about probabilty this way: imagine a 1-litre bottle, it can be empty (0 litre) or full (1 litre) and any value between 0 and 1 but the value can't be negative.