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• n  unusual largeness in size or extent or number

• The human species has a prodigious power to litter, but the popular belief has been that the sheer enormousness of space prevents humans from doing too much damage.
• Perhaps the enormousness of the problem obscures it; the prospect of cleaning waters and preserving forests appears so vast as to be out of the reach of individuals.
• A computer-generated image of objects in Earth's orbit The human species has a prodigious power to litter, but the popular belief has been that the sheer enormousness of space .

• grandness
• greatness
• immenseness
• immensity
• sizeableness
• vastness
• wideness