1. Physical harm, unjustified treatment, or damage that is done or sustained: "When someone hits a person with his car and then yells at him or her and then calls her or him a fool, he would be adding insult to injury."
2. A particular form or instance of harm: injury to one's shoulder; an injury to one's pride.
3. Wrong or injustice done or suffered.
4. In law, any wrong or violation of the rights, property, reputation, etc., of another person for which legal action to recover damages may be made.
5. From Latin injuria "wrong, hurt" and injurius "wrongful, unjust"; from in- "not" plus jus, juris "right, law".

Damage or ill effects suffered by exposure to ionizing radiation, including cellular harm resulting from radiation for diagnostic or therapeutic applications.

The risk of cell death or injury from radiation depends on the type of tissue cells, the stage of cell division at the time of exposure, the intensity and time span of exposure, and the type of radiation administered.

Physical damages to the crescent-shaped pads; for example, between the two points of contact formed by the thigh bone and the shin bone: Damage of the surfaces of the cartilage disks can cause serious meniscus injuries.

Meniscus injuries of the knees are easily caused by the force of abnormal rotations of the two cartilage pads while carrying the weight of the body.

A meniscus injury may be caused by a partial or total tear of a tissue and it may take place when a person twists suddenly or rotates the upper leg while the foot stays in place; for example, when dribbling a basketball around an opponent or turning to hit a tennis ball.

If there is a very small tear, the tendon will stay connected to the front and back of the knee; however, if there is a big rupture, the meniscus injury may be left hanging by a thread and the seriousness of such a ripping apart depends on its location and how much has been damaged.

Damage or a wound that is caused by a sharp object: Grover, the carpenter, was rushed to the hospital after suffering from penetrating injuries when he fell on a board with nails sticking up and penetrated into his backside and into the underlying tissues of his skin.