Real Dictionary

disease
a continuous progression from one point to the next in time or space; onward movement [...]
a distinct step or period of development, growth, or progress [...]
a representation, usually on a smaller scale, of a device, structure, etc [...]
a series of actions that produce a change or development [...]
a social or professional position, condition, or standing to which varying degrees of responsibility, privilege, and esteem are attached [...]
a system or structure of moving parts that performs some function, esp in a machine [...]
a unit of heredity composed of DNA occupying a fixed position on a chromosome (some viral genes are composed of RNA). A gene may determine a characteristic of an individual by specifying a polypeptide chain that forms a protein or part of a protein ( stru
any impairment of normal physiological function affecting all or part of an organism, esp a specific pathological change caused by infection, stress, etc, producing characteristic symptoms; illness or sickness in general [...]
something that is carried; load [...]
the act of progressing; advancement [...]
the act or process of transmitting [...]
the condition of a person, thing, etc, with regard to main attributes [...]
the origin, development, and resultant effects of a disease [...]
the physical and biochemical characteristics of an organism as determined by the interaction of its genetic constitution and the environment [...]
the quality or condition of being susceptible [...]
You can refer to a bad attitude or habit, usually one that a group of people have, as a disease.
variable noun: A disease is an illness which affects people, animals, or plants, for example one which is caused by bacteria or infection.