noun

• A low-bred, presuming person; a mean, vulgar fellow, especially one that cannot be trusted with a lady.
• (archaic) A person who stands at the door of an omnibus to open and shut it, and to receive fares; a bus conductor.
• (UK, Ireland, obsolete, slang) An idle hanger-on about innyards.
• (computing, engineering) Initialism of computer-aided design. [The process of using drawings made by using a computer to design machines, buildings, etc.]
• (computing) Initialism of computer-aided drafting.
• (computing) Initialism of control alt delete.
• (import/export) Initialism of cash against documents: an arrangement where the purchaser must pay the total price in cash in order to get shipping papers from the seller or (usually) a third party.
• (medicine) Initialism of coronary artery disease. [(pathology, cardiology) Any disease caused by the accumulation of fatty deposits in the coronary arteries that supply blood to the myocardium.]
• (medicine) Initialism of computer-aided diagnosis.
• (medicine) Initialism of cold agglutinin disease. [A rare autoimmune disease characterized by the presence of high concentrations of circulating cold-sensitive antibodies directed against red blood cells, causing them to agglutinate and undergo lysis.]
• (public safety) Initialism of computer-aided dispatch.