What is the meaning of Godfather?

A man present at the christening of a baby who promises to help raise the child in a Christian manner; a male godparent who sponsors the baptism of a child.

Someone who plays a key role in fostering the development of something.

A mafia leader.

A small post which is used in repairing a fence. For instance attached to and supporting an existing broken fence post.

To act as godfather or guardian to.

Source: wiktionary.org