infinity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The quality or condition of being infinite.
• noun Unbounded space, time, or quantity.
• noun An indefinitely large number or amount.
• noun Mathematics The limit that a function ƒ is said to approach at x = a when ƒ(x) is larger than any preassigned number for all x sufficiently near a.
• noun A range in relation to an optical system, such as a camera lens, representing distances great enough that light rays reflected from objects within the range may be regarded as parallel.
• noun A distance setting, as on a camera, beyond which the entire field is in focus.

from The Century Dictionary.

• noun An infinite number: as, an infinity of straight lines. Its symbol is ∞.
• noun The condition of being infinite or the greatest possible; immeasurableness; innumerability; perfection: as, the infinity of God; infinity of duration.
• noun Unlimited extension; figuratively, exhaustless quantity or number: as, inconceivable infinity; an infinity of details.
• noun In geometry, the part of space at an infinite distance from the part chiefly considered.

from the GNU version of the Collaborative International Dictionary of English.

• noun Unlimited extent of time, space, or quantity; eternity; boundlessness; immensity.
• noun Unlimited capacity, energy, excellence, or knowledge.
• noun Endless or indefinite number; great multitude; as an infinity of beauties.
• noun (Math.) A quantity greater than any assignable quantity of the same kind.
• noun (Geom.) That part of a line, or of a plane, or of space, which is infinitely distant. In modern geometry, parallel lines or planes are sometimes treated as lines or planes meeting at infinity.
• noun an imaginary circle at infinity, through which, in geometry of three dimensions, every sphere is imagined to pass.
• noun See under Circular.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Limitlessness, unlimitedness, something which is growing without limits or bounds.
• noun A number that has an infinite numerical value that cannot be counted.
• noun 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.
• noun The symbol ∞.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun time without end