PCA

Proper Noun

• Abbreviation of Proto-Central Algonquian
• Abbreviation of [[posse comitatus The U.S. law called "Posse Comitatus Act", 20 Stat. 152 aka 18 U.S.C. § 1385

Noun

• Abbreviation of propulsion controlled aircraft (system/unit), an aircraft with a control system with two or more engines arrayed abreast, allowing descent, ascent, turns by adjusting the throttle control to the engines .
• Abbreviation of w:principal components analysis
• Abbreviation of w:patient-controlled analgesia; palliator.
• Initialism of posterior cerebral artery