/ Dictionary / Index M mutable sign: Meaning and Definition of Find definitions for: mu'table sign' Pronunciation: [key] any of the four astrological signs, Gemini, Virgo, Sagittarius, or Pisces, that are grouped together because of their placement at the end of the seasons and characterized by the attribute of adaptability to circumstances. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mutable mutagen Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language