Englishfor English speakers
unvariable
adjective
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(obsolete) Invariable.
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.