Definition of foster

• v. t. - To feed; to nourish; to support; to bring up.
• v. t. - To cherish; to promote the growth of; to encourage; to sustain and promote; as, to foster genius.
• v. i. - To be nourished or trained up together.
• v. t. - Relating to nourishment; affording, receiving, or sharing nourishment or nurture; -- applied to father, mother, child, brother, etc., to indicate that the person so called stands in the relation of parent, child, brother, etc., as regards sustenance and nurture, but not by tie of blood.
• n. - A forester.
• n. - One who, or that which, fosters.