This is the 4502nd most frequent German word.
mitgegangen
"Mitgegangen" means "went along" or "accompanied."
'Mitgegangen' here is used to indicate the conditional possibility of joining others in going to the cinema.
Du hättest auch mit uns ins Kino mitgehen können.
You could have also gone along with us to the cinema.
'Mitgegangen' in this context, though synonymous with 'mitgehen,' expresses agreement or support within a figurative context.
Solange du ehrlich bist, gehe ich bei deinem Plan mit.
As long as you are honest, I am going along with your plan.
In this sentence, 'mitgegangen' refers to the past action of accompanying someone's walk.