Definition

1. Noun:
   • (Biology) The process of an individual organism growing organically; the biological development of an organism from its inception to maturity. This term refers to the entire sequence of events involved in an organism changing gradually from a simpler to a more complex level, encompassing embryonic development, growth, and differentiation.

Usage Examples

• Noun:
  • The study of ontogenesis helps scientists understand how genetic instructions are expressed over an organism's lifetime.
  • In his research, he focused on the ontogenesis of the nervous system in amphibians.

Advanced Usage

• "Principle of ontogenesis": A concept in biology stating that the development of an individual (ontogeny) recapitulates the evolutionary history of its species (phylogeny), though this idea is now considered an oversimplification.
  • The old theory suggested a direct parallel between ontogenesis and phylogeny.

Variants and Related Words

• Ontogeny (n): A direct synonym for ontogenesis, referring to the origin and development of an individual organism.
  • The terms ontogeny and ontogenesis are used interchangeably in biological literature.
• Ontogenetic (adj): Pertaining to or arising from ontogenesis.
  • Researchers observed significant ontogenetic changes in the fish's behavior.

Synonyms

• Development: The process of growth and change.
• Growth: The process of increasing in physical size and maturity.
• Maturation: The process of becoming mature, reaching full development.

Antonyms

• Senescence: The process of growing old and deteriorating.
• Degeneration: A decline to a lower or less functional state.

Related Terms (Contextual)

• Phylogeny: The evolutionary development and history of a species or group of organisms, often contrasted with ontogenesis.
• Embryogenesis: The specific formation and development of an embryo, which is a key phase within ontogenesis.

Noun

1. (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
   • he proposed an indicator of osseous development in children