Multiple instances or kinds of differences or unlikenesses between things; the plural of dissimilarity.
From Latin dissimilaris (dis- 'not' + similis 'like') plus -ity forming a noun, then -ies for plural. The root similis relates to 'same' or 'like,' so dis-similar means fundamentally 'not like.' This word family has been used since Latin to describe differences.
While 'similarities' and 'differences' are common words, 'dissimilarities' is the formal term that scientists use when cataloging exactly how species differ or when comparing complex data—it emphasizes the multiple, measurable ways things diverge.
Complete word intelligence in one call. Free tier — 50 lookups/day.