1. transmute, transform; vary, mutate; amend, modify. Change, alter both mean to make a difference in the state or condition of a thing or to substitute another state or condition. To change is to make a material difference so that the thing is distinctly different from what it was: to change one's opinion. To alter is to make some partial change, as in appearance, but usually to preserve the identity: to alter a dress (to change a dress would mean to put on a different one). 3. replace, trade. 4. trade. 7. convert. 10. vary, mutate, amend. 18. transmutation, mutation, conversion, vicissitude. 21. exchange. 25, 26. replacement.