clusivity

thumb|300px|Sets of reference: Inclusive form (left) and exclusive form (right) In linguistics, clusivity is a grammatical distinction between inclusive and exclusive first-person pronouns and verbal morphology, also called inclusive "we" and exclusive "we". Inclusive "we" specifically includes the addressee, while exclusive "we" specifically excludes the addressee; in other words, two (or more) words that both translate to "we", one meaning "you and I, and possibly someone else", the other meaning "I and some other person or persons, but not you". While imagining that this sort of distinction could be made in other persons (particularly the second) is straightforward, in fact the existence of second-person clusivity (you vs. you and they) in natural languages is controversial and not well attested. While clusivity is not a feature of the English language, it is found in many languages around the world.

The first published description of the inclusive-exclusive distinction by a European linguist was in a description of languages of Peru in 1560 by Domingo de Santo Tomás in his Grammatica o arte de la lengua general de los indios de los Reynos del Perú, published in Valladolid, Spain.