/ Dictionary / Index O OTS: Meaning and Definition of Find definitions for: OTS Pronunciation: [key] Officers' Training School. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Otranto ottar Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language