Quartile

Part of speech: noun

Pronunciation: /ˈkwɔː(ɹ)taɪl/

Definitions

1. A statistical measure that identifies one of three boundary values dividing a data set into four equal segments, reflecting the distribution of values within sorted observations
2. A statistical term that represents one of the four divisions of a data set, helping to categorize values and their distribution among ordered observations
3. This concept involves dividing a dataset into four equal parts, each marked by a specific statistical boundary that highlights value distribution

Etymology: The word "quartile" is built from two parts that both come from Latin. "Quart" is the Latin "quartus", meaning "fourth", and "-ile" is a suffix that signals something related to or belonging to a thing, as in "juvenile" or "mobile". Together they point to the idea of a fourth part, and statisticians use the term for the boundary values that cut a sorted dataset into four equal portions. The word arrived in English by way of Middle French "quartil", which in turn came from Medieval Latin "quartilus". Medieval Latin was the scholarly Latin used across Europe after the classical period, so the term reflects a later stage of the language than the classical Romans knew. Its path into English ran through French, which is typical for technical vocabulary of this period.