/ Dictionary / Index T Thales: Meaning and Definition of Find definitions for: Tha•les Pronunciation: (thā'lēz), [key] — n. c640–546?b.c.,Greek philosopher, born in Miletus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thales (Thesaurus) thaler Thalia Related Content Daily Word Quiz: ravenous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language