gon‧na /ˈɡɒnə, ɡənə $ ˈɡɒːnə, ɡənə/ spoken informal
a way of saying ‘going to’:
This isn’t gonna be easy.

[TahlilGaran] Dictionary of Contemporary English ▲

gonna

BAD: Do you know when the plane is gonna land?
GOOD: Do you know when the plane is going to land?
BAD: The principal is gonna give a talk in the morning.
GOOD: The principal is going to give a talk in the morning.

Usage Note:
Do not use gonna (= going to ) or wanna (= want to ) unless you are trying to represent informal conversation.

[TahlilGaran] Dictionary of Common Errors ▲