The American Heritage® Dictionary of the English Language, 4th Edition
n. The value of the boundary at the 25th, 50th, or 75th percentiles of a frequency distribution divided into four parts, each containing a quarter of the population.
n. Any of the three points that divide an ordered distribution into four parts, each containing a quarter of the population.
n. Any one of the four groups so divided.
the GNU version of the Collaborative International Dictionary of English
n. Same as quadrate.
The Century Dictionary and Cyclopedia
n. In astrology, an aspect of planets when their longitudes differ by 90°. See aspect, 7.
n. That point on a frequency-curve above or below which one fourth of the total number of cases are found.
Involving an angular distance of 90°.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. (statistics) any of three points that divide an ordered distribution into four parts each containing one quarter of the scores
Word Usage
"It was a bet on the bottom 3/4th or so of American society, in particular on the second quartile from the bottom, because that’s where the incremental homeowners needed to push the home ownership from 64% to 69% would primarily come from."