Context: The dialects of the Catalan language feature a relative uniformity, especially when compared to other Romance languages; both in terms of vocabulary, semantics, syntax, morphology, and phonology. Mutual intelligibility between dialects is very high, estimates ranging from 90% to 95%. The only exception is the isolated idiosyncratic Alguerese dialect.

Question: What do the dialects of Catalan feature?
Answer: uniformity

Question: In comparison to what are the dialects uniform?
Answer: other Romance languages

Question: What is high among dialects?
Answer: intelligibility

Question: What is the percentage of intelligibility between dialects?
Answer: 90% to 95%

Question: What dialect is the exception to intelligibility?
Answer: Alguerese