When it comes to Romance languages, the connections between them are undeniable. From the rolling Rs of Spanish to the lyrical flow of Italian, these languages all evolved from Latin, yet they’ve grown into distinct identities over the centuries. But have you ever wondered: which languages are so closely related that they’re practically twins?

To answer this question, we’ll be diving into the fascinating concept of language similarity, which looks at how much vocabulary two languages share. Linguists often measure this using: lexical similarity—a way of comparing the words in different languages to see how alike they are. Think of it as asking: “How often do speakers of two languages use words that look and sound the same?“

Using the table above, which compares Spanish, Portuguese, Italian, French, Romanian, and Catalan, we’ll explore just how closely these languages are connected. This table shows the percentage of shared words between each pair, giving us a clear picture of which languages are close cousins—and which are a bit more distant.

Let’s break down the numbers and discover which Romance languages are so similar that speakers of one can almost instantly understand the other! The higher the number, the closer the language.

Lexical similarities between Romance languages:

Heatmap of the lexical similarities between Romance languages:

To better visualise the similarity between the different Romance language we made a heat map.

General Observations:

1. Highest Lexical Similarity:
   • Spanish and Portuguese share the highest similarity, at 89%, making them the most closely related languages in this table.
2. Lowest Lexical Similarity:
   • Romanian and Catalan have the lowest similarity, at 55%, reflecting the greater linguistic divergence of Romanian from the Western Romance languages.
3. Catalan’s Unique Position:
   • Catalan is nearly equally similar to Spanish and Portuguese (both 85%) and is closer to French (78%) than to Italian (70%). This reflects its geographical and historical bridging role between the Iberian and Gallo-Romance branches.

Language Pair Comparisons:

1. Spanish’s Connections:
   • Spanish has stronger connections with Portuguese (89%) and Catalan (85%) than with French (75%) or Romanian (65%). This highlights its closer ties to the Iberian Peninsula and divergence from Eastern Romance languages.
2. French’s Role:
   • French shows significant similarity to both Italian (85%) and Catalan (78%), but its similarity drops to 70% with Portuguese and 60% with Romanian. This reflects its position as a central Gallo-Romance language.
3. Romanian’s Isolation:
   • Romanian, while still a Romance language, is more distantly related to others. Its highest similarity is 65%with Italian and Spanish, reflecting its Eastern Romance origins and Slavic influence.

Statistics:

1. Average Similarity:
   • The average lexical similarity across all pairs of Romance languages in the table is approximately 77%.
2. Most Similar Languages:
   • Spanish, with an average similarity of 83.2% to the other languages in the table, is the most lexically similar on average.
3. Least Similar Language:
   • Romanian, with an average similarity of 61.7%, is the least lexically similar language to the others, confirming its unique development path within the Romance family.

Patterns and Implications:

1. Iberian Cluster:
   • Spanish, Portuguese, and Catalan form a clear cluster with high mutual similarity (all above 85%), suggesting significant mutual intelligibility.
2. Italo-French Bridge:
   • Italian and French serve as linguistic bridges within the Romance family, with high similarity to both Iberian and Eastern Romance languages.
3. Romanian as an Outlier:
   • Romanian’s position highlights the impact of historical isolation and external influences (e.g., Slavic and Balkan languages) on its vocabulary and grammar.