Waarin
Waarin is a Dutch fused relative pronoun used to introduce a relative clause that specifies a location or containment, equivalent to the English phrase “in which.” It refers back to a noun in the main clause and describes the space, container, or domain inside which something occurs or exists.
The form ontstaan from the combination of the relative word waar (where) and the preposition in, yielding
Waarin is most commonly used in written Dutch and in formal or careful speech. In everyday speech,
See also: Dutch grammar, relative clauses, fused relative pronouns, where/how compounds in Dutch.