post hoc 
(hŏk, hōk)
(hŏk, hōk)adv. & adj.
In or of the form of an argument in which one event is asserted to be the cause of a later event simply by virtue of having happened earlier: grasping at reasons post hoc; a post hoc fallacy.
[Latin, short for post hoc, ergō propter hoc, after this, therefore because of this : post, after + hoc, neuter of hic, this.]