/ Dictionary / Index A arbtrn.: Meaning and Definition of Find definitions for: arbtrn. Pronunciation: [key] arbitration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arbovirus Arbuthnot Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language