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Noun: inertia  in'ur-shu
  1. A disposition to remain inactive or inert
    "he had to overcome his inertia and get back to work";
    - inactiveness, inactivity
  2. (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force

Derived forms: inertias

Type of: mechanical phenomenon, trait

Encyclopedia: Inertia