We are thrilled to announce the publication of TIDE's first major collaborative output -- the online, open access resource, TIDE: Keywords. Keywords is the product of 18 months of collaborative work by the whole TIDE team, producing 39 short essays on a selection of keyword terms covering topics related to language, Renaissance, travel, migration, religion, diplomacy, and national/cultural identity. The selection of words examined in TIDE: Keywords all reveal similarly complex histories of usage; in many cases, the concepts, preconceptions, and debates that they embody (or subsume) came to play seminal roles in articulations of identity, rights, and power in subsequent periods. Our aim is not to settle on a single definitive description, but to illuminate precisely the complexity – and often, the multiplicity – inherent in the usage of these terms in early modern English. Each essay and citation of usage offered here emphasises the fact that the terms in question share a certain slipperiness, that they are altered, revised and transformed repeatedly by multiple imperatives. TIDE: Keywords will continue to be a work in progress throughout the duration of the project, with new examples and interrogations added as fresh material emerges through our collective research.