/ Dictionary / Index D deka-: Meaning and Definition of Find definitions for: deka- Pronunciation: [key] a combining form meaning “ten,” used in the names of metric units which are ten times the size of the unit denoted by the base word:Also, esp. before a vowel,Cf. deci-. dekaliter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. de jure dekadrachm Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language