The state or quality of having equal or identical form and structure.
From 'equiform' with the suffix '-ity' (used to form nouns indicating state or condition). It parallels words like 'uniformity' but specifies equal rather than consistent form.
Like many 'equi-' words, this noun was theoretically possible but scientists preferred 'homology' or 'isomorphism' because those terms came with precise mathematical definitions already built in.
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