Dissimilarity (noun)

1. The state or quality of being different or not alike.
2. A difference or lack of similarity between things or people.

Origin:

Derived from the prefix 'dis-' meaning opposite or reversal and the word 'similarity' meaning likeness or sameness.

Examples:

1. The dissimilarity between the two theories was a major challenge for the scientists.
2. The dissimilarity in their personalities made it difficult for them to work together.
3. The dissimilarity between the two cultures was apparent in their customs and beliefs.
4. The dissimilarity between the two samples was the basis for the research.
5. The dissimilarity in the data was a significant concern for the analyst.