WordReference Random House Unabridged Dictionary of American English © 2026
flu•id•i•ty
(flo̅o̅ id′i tē),USA pronunciation n.
WordReference Random House Learner's Dictionary of American English © 2026- Hydraulicsthe quality or state of being fluid.
- Hydraulics, Physics[Physics.]
- the ability of a substance to flow.
- Physicsa measure of this ability, the reciprocal of the coefficient of viscosity. Cf. rhe.
- fluid + -ity 1595–1605
flu•id /ˈfluɪd/USA pronunciation
n.
adj.
flu•id•ly, adv. See -flu-.
WordReference Random House Unabridged Dictionary of American English © 2026- Hydraulics, Physicsa substance, such as a liquid or gas, that is capable of flowing and that changes its shape when acted upon by a force: [uncountable]Fluid dripped from the tank.[countable]to drink fluids.
adj.
- Hydraulicsflowing or capable of flowing:a fluid substance.
- changing easily or readily; not fixed, stable, or rigid:Our plans are fluid.
- smooth and flowing:a dancer with fluid gestures.
- Businessconvertible into cash;
liquid:fluid assets.
flu•id•ly, adv. See -flu-.
flu•id
(flo̅o̅′id),USA pronunciation n.
adj.
flu′id•al, adj.
flu′id•ly, flu′id•al•ly, adv.
flu′id•ness, n.
- Hydraulics, Physicsa substance, as a liquid or gas, that is capable of flowing and that changes its shape at a steady rate when acted upon by a force tending to change its shape.
adj.
- Hydraulicspertaining to a substance that easily changes its shape;
capable of flowing. - Hydraulicsconsisting of or pertaining to fluids.
- changing readily;
shifting;
not fixed, stable, or rigid:fluid movements. - convertible into cash:fluid assets.
- Latin fluidus, equivalent. to flu(ere) to flow + -idus -id4
- 1595–1605
flu′id•ly, flu′id•al•ly, adv.
flu′id•ness, n.
- 2. See liquid.
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'fluidity' also found in these entries (note: many are not synonyms or translations):
