Noun

(uncountable) Existence without end, infinite time.

* 1829', , ''Sermon LVIII: On the '''Eternity of God'', in ''Sermons on Several Occasions , Volume 2, 10th edition, page 1,

Eternity' has generally been considered as divisible into two parts; which have been termed, '''eternity''' ''a parte ante'', and '''eternity''' ''a parte post'': that is, in plain English, that '''eternity''' which is past, and that ' eternity which is to come.

* 1886 , , Systematic Theology: a Compendium and Commonplace-book Designed for the Use of Theological Students , page 190,

This theory regards creation as an act of God in eternity past.

* 2000 , , Human Nature in It's Fourfold State , page 247,

Those who like not the company of the saints on earth will get none of it in eternity'; but, as godless company is their delight now, they will afterwards get enough of it, when they have ' eternity to pass in the roaring and blaspheming society of devils and reprobates in hell.

(uncountable, philosophy) Existence outside of time.

* 1879 , (editor) ''Journal of Discourses , Volume 21,

We sometimes speak of eternity' in contradistinction to time; and often say, "through time and into '''eternity''';" and again "from '''eternity''' to '''eternity'''," which is simply another form of expressing the same idea, and "pass through time into '''eternity'''." in other words, time is a short period allotted to man in his probationary state—and we use the word time in contradistinction to the word ' eternity , merely for the accommodation of man in his finite sphere, that we may comprehend and learn to measure periods.

(countable) A period of time which extends infinitely far into the future.

(metaphysical) The remainder of time that elapses after death.

(informal, hyperbole) A comparatively long time.

It's been an eternity since we last saw each other.

Noun

(label) Endlessness, unlimitedness, absence of end or limit.

A number that has an infinite numerical value that cannot be counted.

* {{quote-magazine, date=2012-01

, author=Michael Riordan , title=Tackling Infinity , volume=100, issue=1, page=86 , magazine= citation , passage=Some of the most beautiful and thus appealing physical theories, including quantum electrodynamics and quantum gravity, have been dogged for decades by infinities' that erupt when theorists try to prod their calculations into new domains. Getting rid of these nagging ' infinities has probably occupied far more effort than was spent in originating the theories.}}

An idealised point which is said to be approached by sequences of values whose magnitudes increase without bound.

(label) A number which is very large compared to some characteristic number. For example, in optics, an object which is much further away than the focal length of a lens is said to be "at infinity", as the distance of the image from the lens varies very little as the distance increases further.

(label) The symbol .