State of Matter That Changes Shape, but Not Volume

Word Meaning:

LIQUID — (physical chemistry) A substance that is flowing, and keeping no shape, such as water; a substance of which the molecules, while not tending to separate from one another like those of a gas, readily change their relative position, and which therefore retains no definite shape, except that determined by the containing receptacle; an inelastic fluid.

Definitions from Wiktionary.