Aspermia is the term used to describe
Aspermia- means no semen Azoospermia- no sperm in semen Asthenospermia-no motile sperms or diminished motility 
Teratospermia- abnormal morphology of sperms.
Absence of semen
Absence of sperm in ejaculate
Absence of sperm motility
Occurrence of abnormal sperm