similarity of form, as in different generations of the same life cycle
2. chemistry
the existence of two or more substances of different composition in a similar crystalline form
3. mathematics
a one-to-one correspondence between the elements of two or more sets, such as those of Arabic and Roman numerals, and between the sums or products of the elements of one of these sets and those of the equivalent elements of the other set or sets
isomorphism in American English
(ˌaɪsoʊˈmɔrˌfɪzəm; ˌaɪsəˈmɔrˌfɪzəm)
noun
1. Biology
a similarity in appearance or structure of organisms belonging to different species or races
2. Chemistry
an identity or close similarity in the crystalline form of substances usually containing different elementsbut having similar composition
3. Ancient Mathematics
a one-to-one correspondence between two mathematical systems, sets, etc. that preserves the basic operations, as the correspondence between binary numbers and decimal numbers, each a set of real numbers