AACR Views 7 meanings found AACR most often refers to the American Association for Cancer Research, a leading medical research body, but the same letters also identify cataloguing standards and regional cancer registries. Medical American Association for Cancer Research Australasian Association of Cancer Registries Miscellaneous Animal-Assisted Crisis Response Anglo American Cataloging Rules Community Association of Americans for Civic Responsibility Governmental American Authority of Central Rights Academic & Science Anglo American Cataloguing Rules