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fluÂ·id. n. A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; a liquid or gas. adj. 1. Of, relating to, or characteristic of a fluid.2.. A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; a liquid or gas. adj. 1. Of, relating to, or characteristic of a fluid.
Princeton's WordNet(4.67 / 3 votes)Rate this definition: 1  fluid(noun) a substance that is fluid at room temperature and pressure. 2  fluid(adj) continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas. 3  fluid, unstable(adj) subject to change; variable.