Englishfor English speakers
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!
matrix
Noun
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A matrix is the situation or conditions in which something else develops or forms.
Within the diverse school matrix, it is likely that there are major differences.
Students need an understanding of literature within a larger matrix of relationships, influences, and effects.
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A matrix is a grid.
Table 2 presents the correlation matrix among the groups and results.
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A matrix is a set of numbers in rows and columns.