mda

MDA can stand for several things depending on context. Common definitions include:

- **3,4-Methylenedioxyamphetamine** – a psychoactive drug related to MDMA.
- **Mail Delivery Agent (MDA)** – software that delivers email to a local mailbox in computing.
- **Muscular Dystrophy Association (MDA)** – a nonprofit organization that supports individuals with muscular dystrophy and related diseases.
- **Model-Driven Architecture (MDA)** – a software design approach defined by the Object Management Group (OMG).

The correct meaning depends on the field being referenced.