ACIS <graphics> Andy, Charles, Ian's System. A {geometric engine} that most {CAD} packages now use. ACIS uses a sophisticated {object-oriented} approach for modelling, the data is stored in {boundary representation}. Acis is owned by {Spatial Technologies}. [How does this differ from "solid modelling"?]. (1996-03-21)
ACIS American Committee for Interoperable Systems (org., USA)