This is a medical root term with a Latin origin and means "to cut". There is a corresponding Greek suffix [-otome], or [-otomy] that has a similar meaning. Uses of this term include:

Incision : "To cut in"
Incisive: Something that "cuts in"
Incisor: Refers to a type of tooth that has a "cutting in" action
Excision: The prefix [ex-] means "out" or "outside". To cut out, or to extirpate. See the meaning of the suffix [-ectomy] here
Circumcision: The prefix [circum-] means "around", or "in a circle". To cut around (in a circle)