Englishfor English speakers
arithmetic
Noun
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The kind of mathematics in which addition, subtraction, multiplication, and division are done on numbers.
My son is starting to do simple arithmetic like math2 + 2 = 4/math.
operation
Noun
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An operation is a medical process, often opening the human body.
The doctors performed the operation in three hours.
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An operation is an action of a group of people working for a goal (often military).
The Army operation was a success.
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An operation is part or all of a business. small(often plural)/small
The company's East Coast operation was bigger than its West Coast operation.
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An operation is a symbol that is used to perform a specific operation (addition, subtraction, multiplication or division) in maths.
The plus symbol is used to perform a specific operation in maths which is addition.
bug
Noun
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An insect of the order Hemiptera (the "true bugs").
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Any insect or spider may often be called a bug.
These flies are a bother. I’ll get some bug spray and kill them.
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A problem that needs fixing, especially in computing.
The computer program has a bug in it.
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A contagious illness caused by bacteria or a virus.
He’s got the flu bug.
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An enthusiasm for something; an obsession.
I think he’s a gold bug, he has over 10,000 ounces in storage.
to catch the skiing bug
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An electronic listening device.
We installed a bug in her telephone.
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A small or invisible image on a webpage that is used to track persons who viewed it.
He suspected the image was a web bug used for determining who was visiting the site.
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A small, usually transparent or translucent image placed in a corner of a television program to indicate what network or cable channel is televising it.
He did not like the network bug that appeared onscreen.
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Figurative - A manually positioned marker in flight instruments.
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A semi-automated telegraph key.
bug
Verb
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To annoy.
Don’t bug me, I’m busy!
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To put an electronic listening device somewhere.
We need to know what’s going on. We’ll bug his house.