1 promote, encourage, stimulate, further, forward, advance, cultivate, nurture, nourish, support, back, assist, help, aid, succour, patronize:
Cutting back these offshoots fosters growth of the main stem. Representatives have fostered acceptance of our products throughout Europe.
2 bring up, rear, raise, take care of, maintain, care for:
The Cartwrights have fostered eight orphans in their home.