1. to care for and raise a child that is not one's own, usually temporarily and often with payment from a government or organization
2. to encourage or promote the development or growth of something

Examples

• She fostered three children over the years before adopting one.
• The teacher fostered a love of reading in her students.
• The organization fostered collaboration between different departments.
• They fostered an environment of trust and respect in their home.
• The program fostered innovation by giving employees time to experiment.
• He was fostered by his grandparents after his parents moved abroad.