Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The quality or condition of being infinite.
  • n. Unbounded space, time, or quantity.
  • n. An indefinitely large number or amount.
  • n. Mathematics The limit that a function ∫ is said to approach at x = a when ∫(x) is larger than any preassigned number for all x sufficiently near a.
  • n. 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.
  • n. A distance setting, as on a camera, beyond which the entire field is in focus.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. Unlimited extent of time, space, or quantity; eternity; boundlessness; immensity.
  • n. Unlimited capacity, energy, excellence, or knowledge.
  • n. Endless or indefinite number; great multitude; as an infinity of beauties.
  • n. A quantity greater than any assignable quantity of the same kind.
  • n. 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.

from The Century Dictionary and Cyclopedia

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

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

  • n. time without end

Etymologies

From Latin infinitas ("unlimitedness"), from negative prefix in- ("not"), + finis ("end"), + noun of state suffix -tas. (Wiktionary)

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