fertility; fecundity
Medical term referring to the ability to conceive or reproduce. Used in clinical contexts.
Decreased fertility is one cause of infertility.
This treatment aims to preserve fertility.
生殖能力 is a broader term for reproductive ability in general, not limited to conception.
Compound of 妊 (にん, 'pregnancy'), 孕 (よう, 'conceive'), and 能 (のう, 'ability'). The exact derivation is uncertain; it is a modern medical coinage.