Linguistics
In linguistics, specifically syntax, an element may be said to be in situ if it is pronounced in the position where it is interpreted. For example, questions in languages such as Chinese have in situ wh-elements, with structures comparable to "John bought what?" with what in the same position in the sentence as the grammatical object would be in its affirmative counterpart, for example, "John bought bread" while English wh-elements are not in situ (see wh-movement): "What did John buy?"
Read more about this topic: In Situ