(n.) The state or quality of being immense; unlimited or immeasurable extension; infinity; vastness in extent or bulk; greatness.

all-comprehensiveness all-inclusiveness ampleness amplitude boundlessness bulk countlessness endlessness enormity enormousness eternity exhaustlessness expanse forever formidableness fullness gigantism grandeur grandness great scope greatness hugeness illimitability immeasurability incalculability incomprehensibility inexhaustibility infiniteness infinitude infinity innumerability intensity interminability largeness limitlessness magnitude measurelessness might mightiness monstrosity monstrousness muchness numberlessness perpetuity plenitude power prodigiousness strength stupendousness termlessness tremendousness universality unmeasurability vastness world without end