Definition from Wiktionary, the free dictionary
percentile (plural percentiles)
- (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.
- He is highly intelligent – he has an IQ in the top percentile.
any of the ninety-nine points
any one of the hundred groups so divided
Derived terms 
Coordinate terms 
percentile m (plural percentili)
- (statistics) percentile