v. i. & t. [ imp. & p. p. Incubated p. pr. & vb. n. Incubating ] [ L. incubatus, p. p. incubare to lie on; pref. in- in, on + cubare to lie down. Cf. Cubit, Incumbent. ] 1. To sit, as on eggs for hatching; to brood; to brood upon, or keep warm, as eggs, for the purpose of hatching. [ 1913 Webster ]

2. To maintain (a living organism, such as microorganisms or a premature baby) under appropriate conditions, such as of temperature, humidity, or atmospheric composition, for growth; as, coliform bacteria grow best when incubated at 37° C.. [ PJC ]

3. To develop gradually in some interior environment, until fully formed; as, the ideas for his book were incubating for two years before he began to write. [ PJC ]