* Delhi Development Authority: This is the most common meaning, particularly in India. The DDA is a statutory body responsible for planning and development of Delhi.
* Digital Differential Analyzer: A type of analog computer used for solving differential equations.
* Direct Digital Access: Refers to a method of accessing digital data directly without going through a modem or other intermediary device.
* Data Display Adapter: An older type of graphics card for IBM-compatible PCs.
* Direct Deposit Account: A bank account set up to receive automatic payments from an employer or other entity.
* Decision-Making Authority: Refers to the person or group responsible for making decisions in a specific situation.
To know the exact meaning of DDA, you need to look at the context in which it is used.