Plural of eager, used as a noun to refer to eager people or as a variant of eagerness.
From 'eager' used as a noun (those who are eager) with plural suffix '-s,' a productive process in English that allows adjectives to function as nouns referring to people with that quality.
This demonstrates a quirky feature of English where you can nominalize almost any adjective—like calling enthusiastic people 'enthusiastics'—though most people would just say 'eager people' instead.
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