IAA

IAA is an acronym that can refer to several different concepts, organizations, and a chemical compound, depending on the context.

Indole-3-acetic acid (IAA) is a naturally occurring plant hormone in the auxin family. It regulates growth processes such as cell elongation, apical dominance, and root initiation, and it mediates responses to light and gravity. IAA is produced mainly in young tissues and transported through the plant. Its biosynthesis occurs via multiple pathways, and signaling involves receptor complexes that modulate gene expression through degradation of repressor proteins.

Irish Aviation Authority (IAA) is the state regulator for civil aviation in Ireland. It oversees air traffic safety, licensing and certification of aircraft and personnel, and the investigation of aviation incidents. The IAA collaborates with European aviation authorities to ensure compliance with safety standards and supports Ireland’s aviation infrastructure and operations.

IAA, Inc. is a publicly traded company that operates Insurance Auto Auctions, an online marketplace for salvage, damaged, and used vehicles. The platform targets insurers, fleets, and dealers, offering online auctions and related services. Headquartered in the United States, IAA markets its services through the IAA brand globally.

Because IAA has multiple meanings, readers should rely on context to determine the intended sense. Industry, country, and accompanying terms usually clarify which IAA is being referenced.