The term PART OF ACA is solved by the three-letter word ACT. The acronym ACA stands for the Affordable Care ACT, which is a United States federal statute enacted in 2010. The ACA is also known as Obamacare and it was signed into law by President Barack Obama. The ACA was designed to increase the quality and affordability of health insurance, lower the uninsured rate by expanding public and private insurance coverage, and reduce the costs of healthcare for individuals and the government. The ACT part of ACA stands for the American College Testing, which is a standardized college admissions test used by many colleges and universities in the United States.