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Incision (noun)
A surgical operation.
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Incision (noun)
The act of incising, or cutting into a substance.
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Incision (noun)
Separation or solution of viscid matter by medicines.
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Excision (noun)
The deletion of some text during editing.
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Excision (noun)
The removal of a tumor, etc., by cutting.
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Excision (noun)
The removal of a gene from a section of genetic material.
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Excision (noun)
The fact that, under certain hypotheses, the homology of a space relative to a subspace is unchanged by the identification of a subspace of the latter to a point.
Wiktionary