Percentile vs. Tercile — What's the Difference?

In statistics, a percentile (or a centile) is a score below which a given percentage of scores in its frequency distribution falls (exclusive definition) or a score at or below which a given percentage falls (inclusive definition). For example, the 50th percentile (the median) is the score below which (exclusive) or at or below which (inclusive) 50% of the scores in the distribution may be found.

Alternative form of tertile.

Each of the 100 equal groups into which a population can be divided according to the distribution of values of a particular variable.

Any of the groups that result when a frequency distribution is divided into 100 groups of equal size.

Any of the values that separate each of these groups.

(statistics) Any of the ninety-nine points that divide an ordered distribution into one hundred parts, each containing one per cent of the population.

(statistics) Any one of the hundred groups so divided.

(statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total