Rationale/ˌræʃəˈnæl/ Definition 1 of 1Pro Tip 1/3Decision Making Used when explaining thoughtful decisions, showing that they're not random. The committee provided a rationale for choosing the winning design. Pro Tip 2/3Understanding Actions Helps clarify actions or beliefs that might otherwise be misunderstood. He explained the rationale for his strict policy on attendance. Pro Tip 3/3Arguing Point Strengthens an argument or point of view by providing reasons. She outlined her rationale for disagreeing with the proposed changes.