No sperm at all. The ejaculate is completely devoid of sperm. By contrast, in oligospermia (literally, few sperm) there are some sperm, but fewer than normal.

A condition in which there are no sperm in the semen when a man ejaculates. This may be because the man does not make sperm or because the sperm is blocked from entering the semen. Azoospermia may be [..]

The condition of having no sperm present in the semen.

n. refers to the absence of viable sperm in the semen, usually as a result of failed spermatogenesis.

lack of sperm (pop)

A condition in which semen is present but contains no sperm.

A condition of having no Sperm present in the ejaculate (Semen).

Semen that contains no sperm, either because the testicles can’t make sperm or because the man’s reproductive tract is blocked. BASAL BODY TEMPERATURE (BBT)

The absence of sperm in seminal fluid due to blockage of sperm ducts or impairment of sperm production.

The complete absence of sperms in ejaculated semen. This is one of the causes of male-factor infertility and is usually due to failure of production of sperms by the testis or to obstruction of the tu [..]

absence of sperm in the semen, with resultant infertility. See also oligospermia.