abdominal paracentesis insertion of a trocar through a small incision and into the peritoneal cavity to remove ascitic fluids or inject a therapeutic agent. This is most often done to remove excess fluid in a patient with cirrhosis of the liver. Called also abdominocentesis and peritoneocentesis.
Abstraction is the act of representing essential features without including the background details or explanations. In the computer science and software engineering domain, the abstraction principle is used to reduce complexity and allow efficient design and implementation of complex software systems.
Abstract algebra is a major area in advanced mathematics, studied primarily by professional mathematicians. Elementary algebra differs from arithmetic in the use of abstractions, such as using letters to stand for numbers that are either unknown or allowed to take on many values.