B2 [ before noun ] relating to the mind, or involving the process of thinking:
She had a mental picture (= a picture in her mind) of how the house would look when they finished redecorating it.
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› UK slang crazy
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- This job requires considerable mental agility.
- These mental exercises are designed to break linear thinking habits and encourage the creativity that is needed for innovation.
- He suffers periodic mental breakdowns.
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