solid · adjective /ˈsɒl.ɪd/Full view
Nouns: solid, solidarity, solidity
Adjectives: solid
Verbs: solidify
Adverbs: solidly
solid (HARD)
B2 hard and firm, without holes or spaces
Dictionary examples:

solid ground/rock

a solid object

a solid structure

Learner example:

Having solid ground beneath her feet again she sighed with relief for having survived this adventure. (First Certificate in English; B2; German)

solid (NOT LIQUID/GAS)
C1 not a liquid or a gas
Dictionary examples:

Liquid and solid waste is collected in the tank.

Freeze the mixture for about 3 hours or so until solid.

Learner example:

Of the total amount of electrical power produced in the world, solid fuel is by far the most important contributor (44%). (International English Language Testing System; C1; Swedish)

solid (STRONG)
B2 strong and not easily broken or damaged
Dictionary example:

solid furniture

Learner example:

[If] you have an accident, you have less chance [of] get[ting] hurt if you are sitting in [a] big, solid vehicle. (First Certificate in English; B2; Italian)

solid gold/silver/wood, etc.
C1 gold/silver/wood, etc. with nothing added
Dictionary example:

a solid silver bracelet

Learner example:

The dark marble is easy to keep clean and the solid brass handles look luxur[ious]. (Certificate in Advanced English; C1; Swedish)

solid (CERTAIN)
C2 Solid information, proof, etc. is based on facts and you are certain that it is correct.
Dictionary examples:

This provided solid evidence that he committed the crime.

The drama course gives students a solid grounding in the basic techniques of acting.

Learner example:

It may help you, because you have a solid background and plenty of theoretical information which you could use in practi[c]e. (Certificate of Proficiency in English; C2; Polish)

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