Which of the following best defines the word 'commitment'?

The definition of 'commitment' is best captured by the notion of a formal agreement to do something. This term encompasses the idea of a pledged or binding decision made by an individual or group to undertake a specific action or adhere to a certain course of behavior. Commitment implies a level of seriousness and dedication, often involving responsibilities and obligations that are recognized and accepted by the parties involved.

While casual promises and spontaneous actions may reflect some elements of commitment, they do not capture the full weight and intention behind the word as a formal agreement does. Similarly, an expert analysis pertains more to evaluation or interpretation of data or situations, which is not directly related to the concept of commitment itself. Therefore, the formal aspect of commitment is what distinguishes it and makes the chosen definition the most appropriate.