What does "immensity" mean?

The characteristic or state of being immense.

Immensity

Common synonyms include: vastness, all-comprehensiveness, all-inclusiveness, ampleness, amplitude, awe.

noun

noun ·Moderate ·College level

Noun

1
The characteristic or state of being immense. uncountable
"Thou, whose exterior semblance doth belie / Thy soul's immensity; […]"
2
unusual largeness in size or extent or number wordnet
3
An immense object. countable

"I illuminate myself with immensity."

From Middle French immensité, equivalent to immense + -ity.