Physical growth or development of organs or abilities; often used in medical or biological contexts to refer to the development of children or organisms.
赤ちゃんの発育は順調だと医者が言った。
The doctor said the baby's growth is progressing well.
十分な栄養は子どもの発育に重要だ。
Adequate nutrition is important for a child's development.
筋肉の発育には適切な運動が必要だ。
Proper exercise is necessary for muscle development.