This collection brings together the latest research into the syntax, semantics, phonology, phonetics and morphology of the Celtic languages. Based on presentations given at the Formal Approaches to Celtic Linguistics Conference in 2009, this book contains articles by leading Celtic linguists on Breton, Modern Irish, Old Irish, Scottish Gaelic, and Welsh, on a wide variety of topics ranging from the syntax and semantics of clefts to the articulatory phonology of fortis sonorants.