Post hoc
Definition 1 of 2
Pro Tip 1/3After Events
Used when discussing events that occurred after a highlighted event, not before. 
The policy change was post hoc to the economic crisis.
Pro Tip 2/3Not Cause
Be aware that 'post hoc' doesn't mean that one event caused another, only that it followed it. 
He got sick and, post hoc, lost his job, but his illness didn't cause the job loss.
Pro Tip 3/3Academic Tone
'Post hoc' is common in formal or academic contexts, less so in everyday conversation. 
In a post hoc analysis, we discovered the error.