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English definition of “solid”

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solid

adjective uk   /ˈsɒl.ɪd/ us    /ˈsɑː.lɪd/

solid adjective (HARD)

B2 hard or firm, keeping a clear shape: solid ground a solid object a solid structureB2 completely hard or firm all through an object, or without any spaces or holes: solid rock a solid oak table solid doors/walls a solid line of traffic The lecture hall was packed solid (with students).C1 A solid metal or colour is pure and does not have anything else mixed together with it: solid gold/silver candlesticks a white rose on a solid blue background
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solid adjective (NOT LIQUID/GAS)

C1 not liquid or gas: Liquid and solid waste is collected in the tank. Freeze the mixture for about three hours or so until solid. Solid food is not in liquid form, especially when given to babies or people who are ill: That rice pudding was the first solid food he's eaten since his operation.
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solid adjective (CERTAIN)

C2 certain or safe; of a good standard; giving confidence or support: This provided solid evidence that he committed the crime. The drama course gives students a solid grounding in the basic techniques of acting.
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solid adjective (CONTINUOUS)

continuing for a period of time without stopping: I slept for eleven solid hours. The hotel was booked solid all of December.

solid

noun uk   /ˈsɒl.ɪd/ us    /ˈsɑː.lɪd/

solid noun (OBJECT)

[C] specialized mathematics an object that has a height, width, and length, and is not flat: A cube and a pyramid are both solids.

solid noun (NOT LIQUID/GAS)

[C] a substance that is not liquid or gas [C usually plural] a food not in liquid form
(Definition of solid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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