decile
UK[ˈdɛsaɪl]US[ˈdɛsaɪl]
n
Any one of the nine numbers that divide a set of data into ten equal parts.
n
Any one of the ten groups created by such a division.
Morpheme Breakdown
dec
ile
dec
ten
ile
relating to
Etymology
The word decile is a modern statistical term formed from classical elements. Its first element, dec-, originates from the Proto-Indo-European root déḱm̥t, meaning "ten," which gave rise to Latin decem. The second element, -ile, descends from the Latin adjectival suffix -ilis, which denotes pertinence or capability. Combined, they create a term whose literal meaning is "relating to ten." This logic is applied in statistics, where a decile systematically divides ordered data into ten equal parts, directly extending the ancient numerical concept into a precise tool for quantitative analysis.
Analysis
Structure: dec (ten) + ile (relating to)
dec is from Latin decem, meaning "ten," functioning as a numerical root. ile is a suffix from Latin -ilis, forming adjectives meaning "relating to" or "capable of," here forming a noun.
Examples
The family's income falls into the top decile of the national distribution.
Students scoring in the lowest decile were offered additional tutoring.
The report analyzed sales performance by decile to identify the most productive segments.