Reinforcement of compulsive behaviors refers to the process by which behaviors are strengthened and repeated due to their association with positive outcomes or relief from anxiety. In the context of obsessive-compulsive disorder, individuals often engage in compulsive behaviors as a means to alleviate the distress caused by obsessive thoughts, creating a cycle where the behavior is reinforced each time it successfully reduces anxiety, thereby making it more likely that the individual will repeat the behavior in the future.