Question

What does instantaneous mean?

Answer 1

occurring or done in an instant or instantly.

Step-by-step explanation:

or

existing or measured at a particular instant.

u probably want the first one

Answer 2

Something that is done in a instant, like quickly or out of the ordinary.

Step-by-step explanation:

The dictionary definition is... (Adjective) "occurring or done in an instant or instantly."

an example is... "modern methods of instantaneous communication"

If you are refering to science it is... "existing or measured at a particular instant."