noun

• (slang, by extension) Any source of a large amount of money.
• (banking) Initialism of automated teller machine or initialism of automatic teller machine.
• (computing) Initialism of Adobe Type Manager.
• (telecommunications, electronics) Initialism of asynchronous transfer mode. [A broadband voice and data technology with quality (class) of service QoS transmission for sending and receiving voice, data, and multimedia information over a fiber-optic network.]
• (transport) Initialism of active traffic management.
• (transport) Initialism of advanced traffic management. [Technologies that monitor and manage traffic flow to improve transportation efficiency.]
• (transport) Initialism of air traffic management.
• (transport) Initialism of available ton mile. [(transport, aviation) tons of carrying capacity multiplied by miles travelled.]
• (pornography, vulgar) Initialism of ass to mouth. [(pornography) A sexual act in which the penis or another object is removed from someone's anus and promptly put straight into another's mouth.]
• (astronomy) Initialism of amateur telescope maker.
• (business) Initialism of at the market, see at-the-market offering.