Meaning and usage of the word wane in English

The word "wane" has a fascinating history. It originates from Old English "wanian", which means "to increase" or "to grow". InMiddle English (circa 1100-1500), "wane" developed a new meaning, "to decrease" or "to diminish", likely due to the influence of Old Norse "venja", meaning "to dwindle". In astronomical contexts, "wane" specifically refers to the decreasing brightness of the Moon as it approaches its new phase, opposite to "wax", which describes its increasing brightness as it approaches full Moon. This sense of "wane" likely emerged from the observation of the Moon's cycles and the idea that its light diminishes as it moves away from full illumination. Today, "wane" is used more broadly to describe any decrease or decline, such as a waning interest or a waning influence.