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⇱ inertial - WordReference.com Dictionary of English


WordReference Random House Learner's Dictionary of American English © 2026
in•er•tia /ɪnˈɜrʃə/USA pronunciation   n. [uncountable]
  1. a feeling of inertness;
    sluggishness:was filled with inertia and had no desire to get out of bed.
  2. Physicsthe property of matter by which it keeps its state so long as it is not acted upon by an external force:to overcome the inertia of such a huge mass.
in•er•tial, adj.: inertial guidance systems.

WordReference Random House Unabridged Dictionary of American English © 2026
in•er•tia  (in ûr′shə, i nûr′-),USA pronunciation n. 
  1. inertness, esp. with regard to effort, motion, action, and the like;
    inactivity;
    sluggishness.
  2. Physics
    • the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force.
    • an analogous property of a force:electric inertia.
  3. Medicinelack of activity, esp. as applied to a uterus during childbirth when its contractions have decreased or stopped.
  • Latin: lack of skill, slothfulness. See inert, -ia
  • 1705–15
in•er′tial, adj. 
    1. . torpor, inaction, laziness.
'inertial' also found in these entries (note: many are not synonyms or translations):
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