Merriam-Webster's Word of the Day for October 16, 2026 is zenith. Zenith is a noun that describes the strongest or most successful period for a person or thing. For instance, a company might be at its zenith when it employs a large number of people. One provided example illustrates the zenith of food preparation on screen. This culinary peak was achieved through a character's affectionate preparation of a Baked Alaska. The word zenith signifies reaching the top or the pinnacle of something. Its etymology traces back through Spanish, Arabic, Medieval Latin, and Middle French. Initially, zenith referred to the highest point in the celestial heavens, directly overhead. This celestial meaning dates back to the 1300s in English usage. By the 1600s, the term began to be applied to other kinds of high points. The celestial zenith is often contrasted with nadir, meaning the lowest point.