It means as each second passes (timewise)
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The Geometrical meaning of the second derivative is the curvature of the function. If the function has zero second derivative it is straight or flat.
A millisecond is equal to one thousandth of a second, milli- being the prefix meaning thousandth.
with out a second, no one like him, sole, unique, matchless
The first derivative is the rate of change, and the second derivative is the rate of change of the rate of change.
Only the second meaning is accurate: decimate