Collins COBUILD Advanced Learner's English Dictionary - tank

(tanks) Frequency: The word is one of the 3000 most common words in English. 1. A tank is a large container for holding liquid or gas. ...an empty fuel tank... Two water tanks provide a total capacity of 400 litres. N-COUNT: oft n N 2. A tank is a large military vehicle that is equipped with weapons and moves along on metal tracks that are fitted over the wheels. N-COUNT 3. see also septic tank, think-tank