Englishfor English speakers
activity
Noun
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When a person or animal has activity, it is active or lively.
The sleeping dog did not show much activity.
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When you have a function to do, you have an activity.
The child has many after-school activities.
She participates in women's rights activities.
identifier
Noun
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An identifier is a person or thing that someone or something.
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An identifier is a book that helps to determine the specific class of an object (such as a mushroom, herb or drug), or its individual identity (such as that of a star).