In Christianity this is an epiphany.
In Zen Buddhism this is "Satori" translating as a flash of sudden awareness, or individual enlightenment.
Epiphany.
instantaneous instant coffee, instant success, ...
To get an almost instant answer to your question, make sure that it is free of any misspellings or grammatical errors, is pretty short (and not too long), and does not require a lot of information to answer or explaining (because when a question asks you to explain something, it is a big turn-off to most contributors passing by that question). This is the best way to receive an almost instantaneous answer, but you are not guaranteed an instant answer.
Because when you look at the speedometer it is telling you your speed at that particular instant in time, it changes from instant to instant.
It is the speed or velocity at a particular instant.
That is called the instantaneous speed.
instantly
The word instant is an adjective. It describes something that happens right away.
Instantaneous speed
This is a new term of Google which shows instant results of your search. I don't think that it affects the Rankings for a particular website.
The speed of something in a given direction.
Yes. If someone with an iPod had yahoo messenger, or something else like that, you can instant message them.
it can be calculated at a particular instant as it is total displacement in given time