/ Dictionary / Index G Gatha: Meaning and Definition of Find definitions for: Ga•tha Pronunciation: (gä'tu, -tä), [key] — n. Zoroastrianism. one of several groups of hymnsforming the oldest part of the Avesta. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gateway drug gather Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language