Meaning of stratified random sample

strat'ified ran'dom sam'ple

Pronunciation: [key]
— Statistics. Statistics.
  1. a random sample of a population in which the population is first divided into distinct subpopulations, or strata, and random samples are then taken separately from each stratum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.