1.Definition: containing or composed of fat

"Fatty food", "Fat tissue"

Related Adjective(s):fatty

2.Definition: having a relatively large diameter

"A fat rope"

3.Definition: having an (over)abundance of flesh

"He hadn't remembered how fat she was"

4.Definition: lucrative

"A nice fat job"

Related Adjective(s):juicy

5.Definition: marked by great fruitfulness

"A fat land"

Related Adjective(s):fertile, productive, rich