Plural of adequacy; instances or examples of being sufficient or satisfactory for a particular purpose.
From Latin 'adaequatus,' meaning 'made equal to,' from 'ad-' (to) plus 'aequatus' (equal). The concept evolved from 'making equal' to 'making sufficient,' and the plural form allows discussion of multiple sufficient things.
The word 'adequate' comes from the idea of things being 'equal to' a task—so when you say a tool is adequate for a job, you're saying it equals what that job needs.
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