in situ

adverb, adjective

  1. situated in the original, natural, or existing place or position: The archaeologists were able to date the vase because it was found in situ.
  2. Medicine/Medical.
    1. in place or position; undisturbed.
    2. (especially of a malignant tumor) in a localized state or condition: carcinoma in situ.

adverb, adjective (postpositive)

  1. in the natural, original, or appropriate position
  2. pathol (esp of a cancerous growth or tumour) not seen to be spreading from a localized position

Latin, literally “in its (original) place or position” (see situate (v.)).


  1. In the original position.
  2. Confined to the site of origin.

In the original place or arrangement: “The body was left in situ until the police arrived.” From Latin, meaning “in position.”

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