- 1 a large container for holding liquid or gas a hot water tank a fuel tank a fish tank (= for keeping fish in) see also septic tank, think tank See related entries: The power industry, Diving, Parts of a car
(also tankful BrE BrE//tæŋkfʊl//; NAmE NAmE//tæŋkfʊl//) the contents of a tank or the amount it will hold We drove there and back on one tank of petrol.
- 3 a military vehicle covered with strong metal and armed with guns. It can travel over very rough ground using wheels that move inside metal belts.
- 4(Indian English) an artificial pool, lake or reservoir Word Origin early 17th cent.: perhaps from Gujarati tānkũ or Marathi (a language spoken in the western Indian state of Maharashtra) tānke͂