The lexicon divides into parts of speech (or lexical categories), and there are cross-cutting regularities

(features). These two dimensions of analysis take us a long way, but several phenomena

elude us. For these the term ‘split’ is used extensively (‘case split’, ‘split agreement’, and more),

but in confusingly different ways. Yet there is a unifying notion here. I show that a split is an additional

partition, whether in the part-of-speech inventory or in the feature system. On this

base an elegant typology can be constructed, using minimal machinery. The typology starts from

four external relations (government, agreement, selection, and anti-government), and it specifies

four types of split within each (sixteen possibilities in all). This typology (i) highlights less familiar

splits, from diverse languages, and fits them into the larger picture; (ii) introduces a new relation,

anti-government, and documents it; (iii) elucidates the complexities of multiple splits; and

(iv) clarifies what exactly is split, which leads to a sharpening of our analyses and applies across

different traditions.*