"A Priori" refers to knowledge or justification that is independent of experience. It is often associated with concepts in philosophy and logic, where certain truths can be known without needing empirical evidence. For example, mathematical statements like "2 + 2 = 4" are considered a priori because they can be understood through reasoning alone. In contrast to a posteriori knowledge, which relies on observation and experience, a priori knowledge is seen as universally valid. Philosophers like Immanuel Kant have explored the implications of a priori reasoning, emphasizing its role in understanding fundamental concepts such as space and time.