In medical terms, which of the following signifies an infection caused by an organism?

In medical terminology, the term that signifies an infection caused by an organism is "disease." A disease typically refers to a condition that disrupts normal bodily functions, often resulting from a variety of causes, including infections by bacteria, viruses, fungi, or parasites. Infections specifically denote the invasion and multiplication of pathogenic organisms within the body, leading to an imbalance in health and the possibility of illness.

The other terms do not accurately capture the essence of an infection caused by an organism. Disinfection refers to the process of cleaning something, especially with a chemical to destroy bacteria, viruses, or other pathogens, but it does not describe an infection itself. Disorder is a general term that can refer to any abnormal condition but does not specifically imply an infectious cause. Dislocation is a term used in relation to the displacement of bones at a joint and is not connected to infections at all. Thus, "disease" is the most appropriate choice for describing an infection caused by an organism.