/ Dictionary / Index L law of superposition: Meaning and Definition of Find definitions for: law' of superposi'tion Pronunciation: [key] a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. law of sines law of the jungle Related Content Daily Word Quiz: topography Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language