registernoun
 
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Examples from literature

It's how good ideas happen in business—people working at the cash register figure stuff out, and they tell their bosses. 
The drawer of the cash register shot out with a metallic clang. 
Then he turned to the cash register, and punched up five cents, and began to pull money out of the drawer. 
We have the cash register to educate our clerks into pure and honest character, and the souls of conductors can be seen being nurtured, mile after mile, by fare-recorders. 

cash register | American Dictionary

cash register
noun[ C ]
us/ˈkæʃ ˌredʒ·ə·stər/
a machine in a store or other business in which money is stored and that records sales

cash register | Business English

cash register
noun[ C ]
ukus(US alsoregister)
COMMERCE
a machine in a store or other business that records each sale and where money that is received is kept:
When customers buy shoes, the cash register sends information about the purchase into a computer system.
He said the man worked behind the cash register at his father's business.

Examples of cash register

cash register
Since a cashregister may be regarded as a cognitive system, it must be studied at three different levels.
For a cashregister, everybody knows the answer: the properties of addition correspond to the logical constraints of exchange.
Consider now the second question: why does a cashregister add the prices of the various purchases?
At the computational level, two questions must be answered: what function does a cashregister compute and why does it compute this function?
Thus, while old-fashioned car might be listed enough to account for toy old-fashioned car, no such excuse can be made for toy old-fashioned cashregister.
The shopper has to deal with a girl at the cashregister as she is going out of the shop with her wire tray.
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