1. To make the sound by which people show that they are happy or amused. English = laugh.
2. To be happy and joyful and to show it in your behaviour. English = (be) cheerful.
3. To be funny and make you want to laugh; [especially with stress] to be extremely funny and to make you laugh a lot. English = (be) humorous; (be) hilarious.
4. [Especially with stress] to laugh very loudly and with great energy. Idiomatic English = roar with laughter, (be) in the aisles laughing.