Simple aorist:
The completion or attainment of simple verbal action in past time
Ingressive aorist:
The attainment of the *beginning* of verbal action in past time
Resultive aorist:
The attainment of the *end* of verbal action in past time
Constative aorist:
The complete(not completion of) verbal action in past time
Of course all of the above assumes an augmented aorist in the indicative.
Rich Lindeman