fosterage

/F AA1 S T ER0 IH0 JH/
noun
  1. 1

    The act of fostering another's child as if it were one's own.

  2. 2

    The act of caring for another human being or animal.

  3. 3

    The condition of being the foster child.

  4. 4

    The act of promoting or encouraging something.

Source: https://en.wiktionary.org/wiki/fosterage