Definitions for "P-value"
The probability associated with an obtained statistic, such as an F-ratio.  If the -value is less than the significance level, then the result constitutes evidence against the null hypothesis.
The probability of getting the observed value of the test statistic or more extreme when H0 is true. We reject H0 if p is sufficiently small, sometimes smaller than a predetermined significance level (e.g. 5% or 1%).
The smallest significance level for which the null hypothesis would be rejected, based on the data that was actually observed.
Keywords:  quantile
This is a measure of the proportion of examinees who responded to the item correctly. It is also referred to as the item difficulty index.
The percent of students who answered a test item correctly. The p-value is often used as an indicator of the difficulty level of an item.