fluent
US /ˈfluː.ənt/
UK /ˈfluː.ənt/
1.
able to express oneself easily and articulately
:
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She is fluent in three languages.
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He gave a fluent and engaging presentation.
2.
(of a liquid, typically a gas) flowing freely; not viscous
:
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The lava was still fluent as it poured down the volcano.
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The oil was fluent enough to easily pour from the bottle.