To foster means to help something grow and develop by giving it care and encouragement. A teacher fosters curiosity in her students by asking thoughtful questions and celebrating their discoveries. Parents foster independence by letting their children take on new responsibilities. A coach fosters teamwork by creating opportunities for players to work together and support each other.

The word suggests patient, deliberate nurturing over time. You don't foster something instantly: you foster it through consistent care and attention. A principal might foster a positive school culture by recognizing kindness and celebrating effort. Scientists foster new ideas by sharing their work and building on each other's discoveries.

Foster also has a specific meaning in family care. A foster parent temporarily cares for a child whose birth parents cannot, providing a safe home until the child can return to their family or find a permanent home. A foster child is a young person being cared for by foster parents. These children need stability and love during difficult times, and foster families provide that crucial support.

Whether someone is fostering confidence in a nervous friend, fostering good habits through practice, or fostering a relationship by spending time together, the word always carries the sense of deliberately helping something worthwhile develop and flourish.