APA is an acronym that can refer to several different things. Here are a few common meanings:

1. American Psychological Association: APA is a professional organization in the field of psychology based in the United States. It publishes the Publication Manual of the American Psychological Association, which provides guidelines for academic writing and citation styles commonly used in the social sciences.

2. American Psychiatric Association: Another professional organization based in the United States, the American Psychiatric Association is focused on the study and treatment of mental disorders. It publishes the Diagnostic and Statistical Manual of Mental Disorders (DSM), which is widely used by mental health professionals for diagnosing and classifying mental illnesses.

3. American Planning Association: The American Planning Association is a professional organization that promotes urban and regional planning in the United States. It provides resources, guidelines, and support for planners working in various fields, including land use, transportation, environmental planning, and community development.

4. American Psychological Association style: APA style is a set of rules and guidelines for writing academic papers and citing sources. It is commonly used in the social sciences, including psychology, sociology, education, and related disciplines. APA style specifies rules for formatting papers, citing references, and creating reference lists or bibliographies.

Please provide more context if you were referring to something specific other than the possibilities mentioned above.

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