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solidify

verb
     
so‧lid‧i‧fy past tense and past participle solidified, present participle solidifying, third person singular solidifies
1 [intransitive and transitive] to become solid or make something solid:
The volcanic lava solidifies as it cools.
solidified cream
2 [transitive] to make an agreement, plan, attitude etc more definite and less likely to change:
The two countries signed a treaty to solidify their alliance.
solidification noun [uncountable]

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