1. one of four equal groups into which a set of data is divided when arranged in order from lowest to highest
Usage: statistics
2. any of the three values that divide a data set into four equal parts
Usage: statistics

Examples

• The first quartile contains the lowest 25% of test scores.
• Students in the top quartile received honors recognition.
• The median is the same as the second quartile.
• Her income falls in the third quartile for her age group.
• The data was divided into quartiles for analysis.
• The bottom quartile showed the most improvement over time.