Englishfor English speakers
addition
Noun
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The part of arithmetic where numbers are added together.
He learned addition quickly.
An example of addition is math2+2=4/math.
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The act of adding something.
The addition of 5 more topics will make the meeting very long and boring.
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Anything that is added.
He put an addition on the house.
of
Preposition
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Made using.
It is a house of cards.
series
Noun
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A series of events, meetings, experiments, etc. is several of them that happen one after the other and are related.
Three weeks ago troops and helicopters launched a series of attacks on Kurds in the region.
There has been a series of changes at the newspaper that began with the new editor.
The school will be hosting a series of lectures relating to poverty.
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A TV or Radio series is a number of programs usually with the same setting and characters.
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A series is a sporting event in which many teams compete for a championship.
Tonight is the final game of the Stanley Cup series.
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If something is connected in series, electricity passes through each point before going to the next point.