1. a person who fosters a child; someone who raises a child that is not their biological child, usually under a formal arrangement with a social agency
2. a person who encourages, promotes, or nurtures the development of something (such as an idea, skill, or talent)

Examples

• The fosterer provided a loving home for the child while the biological parents worked toward reunification.
• She became a fosterer of young talent in the music industry, mentoring many aspiring musicians.
• Licensed fosterers must complete training before they can care for children in the system.
• He was a fosterer of innovation, always encouraging his team to think creatively.
• The organization recruits fosterers to provide temporary care for abandoned animals.
• As a fosterer of community spirit, she organized neighborhood events throughout the year.