incubation period
US /ˌɪŋ.kjəˈbeɪ.ʃən ˌpɪr.i.əd/
UK /ˌɪŋ.kjəˈbeɪ.ʃən ˌpɪr.i.əd/

1.
the period between exposure to an infection and the appearance of the first symptoms
:
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The incubation period for the flu is typically one to four days.
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Understanding the incubation period is crucial for controlling disease spread.