Frequent violation of the sonority sequencing principle in hundreds of languages: how often and by which sequences?

Abstract The Sonority Sequencing Principle (SSP) is a fundamental governing principle of syllable structure; however, its details remain contested. This study aims to clarify the empirical status of the SSP in a cross-linguistic study of 496 languages. We adopt a phonetically-grounded definition of sonority – acoustic intensity – and examine how many languages contain SSP-violating clusters word-initially and word-finally. We consider the treatment of complex segments both as sonority units and as clusters. We find a significant proportion of languages violate the SSP: almost one half of the language sample. We examine which clusters cause the violations, and find a wide range: not only the notorious case of clusters with sibilants, but also with nasals, approximants and other obstruents. Violations in onsets and codas are not symmetrical, especially when complex segments are treated as units. We discuss where existing theoretical accounts of the SSP require further development to account for our crosslinguistic results.