condition

noun:the state of something, especially with regard to its appearance, quality, or working order
- The car is in excellent condition.
noun:an illness or other medical problem
- He was diagnosed with a serious heart condition.
noun:a rule or requirement that must be met for something else to happen
- A condition of his employment was that he must be willing to travel.
verb:to train or accustom someone or something to behave in a certain way
- The experiments were designed to condition the rats to press a lever for food.
verb:to bring something into a desired state for use
- The athletes conditioned their bodies for the upcoming competition.