Definitions

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

  • n. A theory of biological evolution holding that species evolve by the inheritance of traits acquired or modified through the use or disuse of body parts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The theory that structural variations, characteristic of species and genera, are produced in animals and plants by the direct influence of physical environments, and especially, in the case of animals, by effort, or by use or disuse of certain organs.

from the GNU version of the Collaborative International Dictionary of English

  • n. The theory that structural variations, characteristic of species and genera, are produced in animals and plants by the direct influence of physical environments, and esp., in the case of animals, by effort, or by use or disuse of certain organs. It is a discredited theory, not believed by modern biologists.

from The Century Dictionary and Cyclopedia

  • n. In biology, the general body of doctrine propounded by the French naturalist J. B. P. A. de Monet de Lamarck (1744–1829); the theory of evolution as maintained by him at the beginning of the nineteenth century, to the effect that all plants and animals are descended from a common primitive form of life.
  • n. The doctrine that the generation of an organism from an egg is epigenesis or new formation.

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

  • n. a theory of organic evolution claiming that acquired characteristics are transmitted to offspring

Etymologies

After Chevalier de Jean Baptiste Pierre Antoine de Monet Lamarck.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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