Merriam-Webster's Word of the Day for August 28, 2026 is cogent. Cogent is a formal adjective meaning very clear and easy to accept or believe. It serves as a synonym for convincing. Cogent arguments strongly present a point because they are clear and understandable. This clarity helps fuse thoughts and ideas into a coherent whole. The word originates from the Latin verb cōgere, meaning to drive or force together. Cōgere itself combines the prefix co- with agere, meaning to drive or lead. Agere is also the root of the word agent, which can mean a means of achieving a result. Therefore, cogency is often a valuable agent. This etymological history explains why cogent arguments are so effective at driving their point home.