Permittito aperiat oculum: typological considerations on P-lability and its interaction with morphosyntactic alignment in Latin medical texts

Abstract This paper explores the diachrony of Latin P-labile verbs (verbs that can be used transitively and intransitively with the preservation of the Patient and without a formal change), availing itself from evidence in medical and veterinary texts from the first to seventh century AD. The first part of the analysis discusses the influence of verbal semantics on the domain of lability in these texts and how lability developed as a diathetic strategy for the anticausative, the causative and the passive in Latin. Special attention is paid to the increase of P-lability as an anticausative strategy and its relation to the mediopassive and reflexive anticausative strategies in Late Latin. The second part of the analysis proposes a new explanation for the increase of P-lability in Latin and discusses the consequences of the development of a semantic-based alignment in Late Latin (the extended accusative) on the syntax and development of P-labile verbs.