Englishfor English speakers
validity
Noun
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The validity of a licence, ticket, document, etc. depends on whether it is official and acceptable.
The validity of a passport depends on who carries it.
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The validity of evidence, a statement, a reason, etc. is the level to which it is true or reasonable.
Due to the doubts about the validity of the evidence presented, the case cannot go forward.
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In testing, the validity of a test is the level to which it is tests what it is supposed to test.
The validity of many IQ tests has been questioned.
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A validity is a quality of measurement that shows the degree by which the measurement reflects the thing beneath it.
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!