Contents -- Editors' preface -- Introduction: the diachrony of agreement -- Part 1: Verbal and adpositional agreement -- Exploring diachronic universals of agreement: alignment patterns and zero marking across person categories -- The transformation of verb agreement into epistemic marking: evidence from Tibeto-Burman -- How to make a comitative preposition agree it-with its external argument: Songhay and the typology of conjunction and agreement -- Part 2: (Pro-)nominal agreement -- The impact of morphology on change in agreement systems -- Pronominal gender agreement: a salience-based competition -- Person-marked quantifiers in Kinyarwanda -- Degrees of agreement in Old Irish -- Part 3: Mismatch constellations and resolution contexts -- Hybrid nouns and their complexity -- When friends and teachers become hybrids (even more than they were) -- Between feminine and neuter, between semantic and pragmatic gender: hybrid names in German dialects and in Luxembourgish -- Gender agreement in 19th- and 20th-century Icelandic -- One plus one make(s) - what? -- Agreement patterns of coordinations in Hittite -- Index of languages -- Index of subjects.