Webster's English Dictionary

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incubation

in.cu.ba.tion \.in-ky*-'ba--sh*n, .in-\ \-shn*l, -sh*n-*l\ n 1: the act or 
   process of incubating  2: the period between the infection of an individual 
   by a pathogen and the  manifestation of the disease it causes - 
   in.cu.ba.tion.al aj