WordReference Random House Learner's Dictionary of American English © 2017
phys•ics /ˈfɪzɪks/USA pronunciation   n. [uncountable; used with a singular verb]
  1. Physicsthe science that deals with matter, energy, motion, and force:Physics is what seems to have interested him the most.
phys•i•cist /ˈfɪzəsɪst/USA pronunciation  n. [countable]See -phys-.

WordReference Random House Unabridged Dictionary of American English © 2017
phys•ics  (fiziks),USA pronunciation n. (used with a sing. v.)
  1. Physicsthe science that deals with matter, energy, motion, and force.
  • see physic, -ics 1580–90

Collins Concise English Dictionary © HarperCollins Publishers::

physics /ˈfɪzɪks/ n (functioning as singular)
  1. the branch of science concerned with the properties of matter and energy and the relationships between them. It is based on mathematics and traditionally includes mechanics, optics, electricity and magnetism, acoustics, and heat. Modern physics, based on quantum theory, includes atomic, nuclear, particle, and solid-state studies. It can also embrace applied fields such as geophysics and meteorology
  2. physical properties of behaviour: the physics of the electron
  3. archaic natural science or natural philosophy
Etymology: 16th Century: from Latin physica, translation of Greek ta phusika natural things, from phusis nature

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