/ Dictionary / Index C Cambrian: Meaning and Definition of Find definitions for: Cam•bri•an Pronunciation: (kam'brē-un), [key] — adj. noting or pertaining to a period of the Paleozoic Era, occurring from 570 million to 500 million years ago, when algae and marine invertebrates were the predominant form of life. See table under of or pertaining to Cambria; Welsh. —n. the Cambrian Period or System. a native of Cambria; Welshman. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cambrian (Thesaurus) Cambria Cambrian Mountains Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language