Cumulative is the correct spelling.
It is an adjective, and means: "increasing or increased in quantity, degree, or force by successive additions: the cumulative effect of two years of drought."
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A cumulative frequency polygon has straight lines connecting the points. A normal cumulative frequency diagram uses a smooth curve to join the points.
in form of percent
I've occasionally seen "cumulative frequency" shortened to the word "cume".
By adding up the (one by one,) the frequency total in order to find the cumulative frequency, most commonly, you just then plot this on a cumulative frequency graph or box plot.
The cumulative frequency of a random variable X for the value x is the number of observations such that X ? x.