- situated in the original, natural, or existing place or position: The archaeologists were able to date the vase because it was found in situ.
- Medicine/Medical.
- in place or position; undisturbed.
- (especially of a malignant tumor) in a localized state or condition: carcinoma in situ.
- in the natural, original, or appropriate position
- (esp of a cancerous growth or tumour) not seen to be spreading from a localized position
