01 adv. & adj. In its natural or original position or place; in position; -- said specif., in geology, of a rock, soil, or fossil, when in the situation …
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1.
In its natural or original position or place; in position; -- said specif., in geology, of a rock, soil, or fossil, when in the situation in which it was originally formed or deposited.
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2.
In its original position; not extending beyond the place of origin; localized and undisturbed; as, carcinoma in situ.(Med.)