Englishfor English speakers
domain
Noun
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A domain is a field or area of knowledge or skill, or of where a rule is in force.
The question of whether there is a god or not is not within the domain of science.
The copyright is expired and the book is now in the public domain.
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A domain is a large area owned by a person or controlled by a government.
The Royal Domain of Drottningholm stands on an island in Lake Mälar in a suburb of Stockholm.
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A domain (name) is a group of internet addresses or URLs that share the same last section (e.g., nowikihttp://simple./nowikiuwiktionary.org/u/wiki/domain is in the wiktionary.org domain.)
If you want to set up a web site, the first step is probably to register a domain name such as amazon.com or google.com.
period
Noun
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A period is a length of time.
There was a short period when my computer stopped working.
During the first period, Germany scored two goals.
The dinosaurs lived from late in the Triassic period (about 225 million years ago) until the end of the Cretaceous (about 65 million years ago).
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A period is the dot that marks the end of most sentences in English. This -> . is a period.
Should I use an exclamation mark or a period at the end of this sentence?
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A woman's period is the time each month when she passes blood.
I have missed two periods now. I think I must be pregnant.
period
Interjection
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And nothing else; and nothing less; used for emphasis.
When I say "eat your dinner," it means "eat your dinner", period!