What is the best definition for the word expedient?

The term "expedient" refers to something that is practical and advantageous, especially in terms of effectiveness and efficiency in achieving a desired outcome. It often implies a choice or action that is convenient and suitable for a particular situation, even if it may not be the most ethical or ideal solution. This aligns perfectly with the definition of "practical," as it encompasses the idea of being useful and effective in real-world applications.

While "grateful" refers to feelings of thankfulness, "unprofitable" suggests a lack of benefit or gain, and "substitute" indicates an alternative option, none of these capture the essence of being practical or effective in the context in which "expedient" is used. The correct definition emphasizes the utility and appropriateness of an action or approach in achieving a goal.