Source : Webster's Revised Unabridged Dictionary (1913)

Fosterage \Fos"ter*age\ (?; 48), n.
   The care of a foster child; the charge of nursing. --Sir W.
   Raleigh.

Source : WordNet®

fosterage
     n 1: encouragement; aiding the development of something [syn: {fostering}]
     2: raising someone to be an accepted member of the community;
        "they debated whether nature or nurture was more
        important" [syn: {breeding}, {bringing up}, {fostering}, {nurture},
         {raising}, {rearing}, {upbringing}]