| Acronym | Definition |
|---|
| ALCA➣Área de Libre Comercio de las Américas |
| ALCA➣Associated Landscape Contractors of America |
| ALCA➣Área de Livre Comércio das Américas (Free Trade Area of the Americas) |
| ALCA➣Acetyl-L-Carnitine Arginate (pharmaceutical) |
| ALCA➣Advanced Light Combat Aircraft |
| ALCA➣Alabama Counseling Association |
| ALCA➣American Landscape Contractors Association |
| ALCA➣Australian Lowline Cattle Association (cattle breeding) |
| ALCA➣American Leather Chemists Association |
| ALCA➣Association de Lutte Contre l'Ambrosia |
| ALCA➣American Lock Collectors Association (Mentor, Ohio) |
| ALCA➣Área del Libre Comercio para Las Américas (Spanish: Free Trade Area of the Americas) |
| ALCA➣Advanced Load Control Alliance (Paragon Consulting Services, Inc.; Portland, OR) |
| ALCA➣Average Linkage Clustering Algorithm |
Alca - type genus of the Alcidae comprising solely the razorbill