A state of being less than normally fertile, but not infertile.

Infertility that is not 'absolute', or 'complete infertility' -- that is, there is a chance of pregnancy: it is not sterility (these last 3 terms are synonyms) -- but the chance of getting pregnant each month (fecundability or monthly fertility) is reduced. More or less definite causes can include oligospermia, polycystic ovary syndrome and other causes of oligomenorrhea, endometriosis, peritubal adhesions, fibroids (especially submucous fibroids) and increased age, especially of the woman. Synonymous with relative infertility. See also: cumulative chance of pregnancy See also: K-selection

A state of reduced fertility.

a reduced likelihood of becoming pregnant due to problems within the reproductive tract.

Term used to describe any impairment of fertility without implying permanent infertility.

A condition whereby fertility is compromised. May respond to treatment