A complete obsession or absorption in a subject or hobby to a point where a person appears to completely tune out their surroundings and where the person repeatedly returns to said subject or material.
The deliberate action of a rational being.
The synthesis of theory and practice, without presuming the primacy of either.
Custom or established practice.
An example or form of exercise, or a collection of such examples, for practice.
The practical application of any branch of learning.