Pca

Abbreviation of

(system/unit), an

with a control system with two or more

,

,

,

by

the

control to the

(sometimes used attributively).

Abbreviation of w:principal

analysis.

Abbreviation of w:patient-controlled

; palliator.

Initialism of

artery.

Abbreviation of Proto-Central Algonquian.

Abbreviation of Posse Comitatus Act. The U.S. law called "Posse Comitatus Act", 20 Stat. 152

18 U.S.C. § 1385

Initialism of Progressive Citizens of America.