conservation

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. an occurrence of improvement by virtue of preventing loss or injury or other change (Freq. 2)
• Syn:
preservation
• Derivationally related forms:
conservationist, conserve
• Hypernyms:
improvement, betterment, advance
2. the preservation and careful management of the environment and of natural resources (Freq. 1)
• Derivationally related forms:
conservationist, conserve
• Hypernyms:
preservation, saving
• Hyponyms:
conservancy, soil conservation, oil conservation, water conservation
3. (physics) the maintenance of a certain quantities unchanged during chemical reactions or physical transformations
• Derivationally related forms:
conserve
• Topics:
physics, natural philosophy
• Hypernyms:
principle
• Hyponyms:
conservation of charge, conservation of electricity, conservation of energy, law of conservation of energy, first law of thermodynamics,
conservation of mass, conservation of matter, law of conservation of mass, law of conservation of matter, conservation of momentum, parity,
conservation of parity, space-reflection symmetry, mirror symmetry