In a way that does not change or vary; maintaining the same pattern or behavior over time.
From Latin 'consistere,' meaning 'to stand together' or 'to be firm,' composed of 'con-' (together) and 'sistere' (to stand). The English adverb developed in the 17th century, emphasizing reliability and unchanging nature.
The etymology reveals that consistency is literally about things 'standing together' - maintaining their position relative to each other over time. This spatial metaphor for temporal reliability shows how we understand time through space.
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