Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: French
Origin: fluide, from Latin fluidus, from fluere 'to flow'

fluid

2 adjective
     
fluid2
1 a situation that is fluid is likely to change
2 fluid movements are smooth, relaxed, and graceful:
a loose, fluid style of dancing
3 a fluid substance is a liquid [↪ gaseous, solid]
—fluidity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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