Great can mean very large in size or amount, or very good and impressive in quality. It is often used informally to mean simply “excellent” or “wonderful.”
“Great” comes from Old English “grēat,” meaning big or coarse. Over time, its meaning expanded from physical size to importance and high quality.
We call grandparents ‘great-grandparents’ as we move another step back, using ‘great’ to mean ‘one more generation away.’ The word stretches from size to distance to quality, which is why context matters so much.
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