To wane is to decrease in amount, to lessen in strength or intensity. The moon is waning because it's getting smaller and less visible in the sky.
The number of students has been waning over the past few years.
The company is waning because it's losing money every year.
verb
To progressively lose its splendor, value, ardor, power, intensity etc.; to decline.
verb
Said of light that dims or diminishes in strength.
verb
Said of the Moon as it passes through the phases of its monthly cycle where its surface is less and less visible.
verb
Said of a time period that comes to an end.
verb
To decrease physically in size, amount, numbers or surface.
verb
To cause to decrease.
adjective
Having wanes, i.e. rounded corners caused by lack of wood, often showing bark.
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What is the cause it waned
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Interest in mariachi music was waning.
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The power of the kingdom began to wane.
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By the end of the 1980s, the band's popularity was waning.
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In feudal Japan, the era of the samurai is waning.
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The popularity of panel vans waned in the 1980s.
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Above the landscape, a rainbow forms in the waning light.
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By the 1880s the influence of the Sheffield FA started to wane.
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By the early 1960s the communist Huk campaign was waning.
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By the fall of 1974 Glitter Rock was waning in popularity.