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Webster 1913 Edition

Noun.

Want of resemblance; unlikeness; dissimilitude; variety;

as, the

dissimilarity

of human faces and forms

Sir W. Jones.

Noun.

Unlikeness; want of resemblance; dissimilitude; as the dissimilarity of human faces and forms.

dissimilarity ‎(plural dissimilarities)

lack of similarity in appearance to something else